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Factors of 84
Factors of 84 are integers that can be divided evenly into 84. It has total 12 factors of which 84 is the biggest factor and the prime factors of 84 are 2, 3 and 7. The Prime Factorization of 84 is 2^{2} × 3 × 7.
 Factors of 84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84
 Negative Factors of 84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84
 Prime Factors of 84: 2, 3, 7
 Prime Factorization of 84: 2 × 2 × 3 × 7 = 2^{2} × 3 × 7
 Sum of Factors of 84: 224
1.  What Are the Factors of 84? 
2.  How to Calculate Factors of 84? 
3.  Factors of 84 by Prime Factorization 
4.  Factors of 84 in Pairs 
5.  Important Notes 
6.  FAQs on Factors of 84 
What are the Factors of 84?
Factors of a given number are the numbers which divide the given number exactly without any remainder.
Hence, the factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84.
84 is strictly smaller than the sum of its factors (except 84).
1 + 2 + 3 + 4 + 6 + 7 + 12 + 14 + 21 + 28 + 42 = 140
So, 84 is known as an abundant number.
How to Calculate the Factors of 84?
Various methods such as prime factorization and the division method can be used to calculate the factors of 84. In prime factorization, we express 84 as a product of its prime factors and in the division method, we see what numbers divide 84 exactly without a remainder.
Hence, the factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84.
Explore factors using illustrations and interactive examples.
 Factors of 120  The factors of 120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
 Factors of 24  The factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24
 Factors of 96  The factors of 96 are 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96
 Factors of 72  The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
 Factors of 42  The factors of 42 are 1, 2, 3, 6, 7, 14, 21, 42
 Factors of 60  The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Factors of 84 by Prime Factorization
Prime factorization means expressing a number in terms of the product of its prime factors. We can do use the division method or factor tree to do this.
1. Prime Factorization by Division method
The number 84 is divided by the smallest prime number which divides 84 exactly, i.e. it leaves a remainder 0. The quotient is then divided by the smallest or second smallest prime number and the process continues till the quotient becomes indivisible.
Since 84 is even, it will be divisible by 2.
Let us divide 84 by the prime number 2
84 ÷ 2 = 42
42 is again even, let's again divide by 2
42 ÷ 2 = 21
Now, 21 is an odd number. So it won't be divisible by 2. Let's check the next prime number i.e. 3
21 ÷ 3 =7
7 is a prime number. So, it's not further divisible.
Prime factorization of 84 = 2 × 2 × 3 × 7
2. Prime Factorization by Factor Tree
The other way of prime factorization as taking 84 as the root, we create branches by dividing it by prime numbers. This method is similar to above division method. The difference lies in presenting the factorization.
The figure below shows the factor tree of 84. The composite numbers will have branches as they are further divisible. We continue making branches till we are left with only prime numbers.
The numbers inside the circles are the prime factors of 84
Now that we have done the prime factorization of our number, we can multiply them and get the other factors. Can you try and find out if all the factors are covered or not? And as you might have already guessed it, for prime numbers, there are no other factors.
Factors of 84 in Pairs
The factor pairs of a number are the two numbers which, when multiplied, give the required number.
Considering the number 84, we have
 1 × 84 = 84
 2 × 42 = 84
 3 × 28 = 84
 4 × 21 = 84
 6 × 14 = 84
 7 × 12 = 84
So, the factor pairs of 84 are : (1, 84), (2, 42), (3, 28), (4, 21), (6, 14), (7, 12)
The product of two negative numbers also results in a positive number i.e. (ve) × (ve) = (+ve).
So, (1, 84), (2, 42), (3, 28), (4, 21), (6, 14), (7, 12). are also factor pairs of 84.
Our focus in this article will be on the positive factors.
Important Notes:
 Every number has a finite number of factors
 The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84
 As 84 is strictly smaller than the sum of its factors (leaving 84), it is called an abundant number.
Factors of 84 Solved Examples

Example 1: Rooney wants to find the number which is three more than the greatest factor of 84, other than 84 Can you find that number?
Solution:
The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84.
Out of these factors, the greatest factor of 84, other than 84 is 42
A number which is three more than 42 = 42 + 3 = 45Hence, 45 is the required number

Example 2: It's time for a Christmas Party! Jennifer baked 40 brownies and 84 cookies for her guests. She wants to pack them in boxes such that each box has equal number of brownies and cookies. What is the least number of boxes she would require for this?
Solution:
To find the least number of boxes such that we can cookies and brownies equally in those boxes, we need to find the GCF (Gretest Common Factor) of 40 and 84
The factors of 40 are 1, 2, 4, 5, 8, 10, 20 and 40
The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84Common factors of 40 and 84 = 1, 2, 4
So, GCF (40, 84) = 4
Hence, the least number of boxes required is 4

Example 3: Julia has two pieces of cloth. The first one is 90 inches wide and the second one is 84 inches wide. She wants to cut the two pieces into equal width so that they are as wide as possible. What width should she consider for this?
Solution:
As we need to cut both size clothes into maximum equal width, we are going to find GCF (90,84)
The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90
The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84The common factors of 90, 84 are 1, 2, 3, and 6. Out of these, 6 is greatest.
Hence, she should consider to cut both the pieces into a width of 6 inches.
FAQs on Factors of 84
What are the Factors of 84?
The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 and its negative factors are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84.
What are the Prime Factors of 84?
The prime factors of 84 are 2, 3, 7.
How Many Factors of 84 are also common to the Factors of 44?
Since, the factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 and the factors of 44 are 1, 2, 4, 11, 22, 44.
Hence, [1, 2, 4] are the common factors of 84 and 44.
What is the Sum of all the Factors of 84?
Sum of all factors of 84 = (2^{2 + 1}  1)/(2  1) × (3^{1 + 1}  1)/(3  1) × (7^{1 + 1}  1)/(7  1) = 224
What is the Greatest Common Factor of 84 and 72?
The factors of 84 and 72 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 and 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 respectively.
Common factors of 84 and 72 are [1, 2, 3, 4, 6, 12].
Hence, the Greatest Common Factor of 84 and 72 is 12.
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