Q: What is the prime factorization of the number 90,846?

 A:
  • The prime factors are: 2 x 3 x 3 x 7 x 7 x 103
    • or also written as { 2, 3, 3, 7, 7, 103 }
  • Written in exponential form: 21 x 32 x 72 x 1031

Why is the prime factorization of 90,846 written as 21 x 32 x 72 x 1031?

What is prime factorization?

Prime factorization or prime factor decomposition is the process of finding which prime numbers can be multiplied together to make the original number.

Finding the prime factors of 90,846

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there is not a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly. Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

If it doesn't make sense yet, let's try it...

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 90,846 by 2

90,846 ÷ 2 = 45,423 - No remainder! 2 is one of the factors!
45,423 ÷ 2 = 22,711.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
45,423 ÷ 3 = 15,141 - No remainder! 3 is one of the factors!
15,141 ÷ 3 = 5,047 - No remainder! 3 is one of the factors!
5,047 ÷ 3 = 1,682.3333 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
5,047 ÷ 5 = 1,009.4 - This has a remainder. 5 is not a factor.
5,047 ÷ 7 = 721 - No remainder! 7 is one of the factors!
721 ÷ 7 = 103 - No remainder! 7 is one of the factors!
103 ÷ 7 = 14.7143 - There is a remainder. We can't divide by 7 evenly anymore. Let's try the next prime number
103 ÷ 11 = 9.3636 - This has a remainder. 11 is not a factor.
103 ÷ 13 = 7.9231 - This has a remainder. 13 is not a factor.
103 ÷ 17 = 6.0588 - This has a remainder. 17 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
103 ÷ 103 = 1 - No remainder! 103 is one of the factors!

The orange divisor(s) above are the prime factors of the number 90,846. If we put all of it together we have the factors 2 x 3 x 3 x 7 x 7 x 103 = 90,846. It can also be written in exponential form as 21 x 32 x 72 x 1031.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 90,846.

90,846
Factor Arrows
245,423
Factor Arrows
315,141
Factor Arrows
35,047
Factor Arrows
7721
Factor Arrows
7103

More Prime Factorization Examples

90,84490,84590,84790,848
22 x 131 x 1,747151 x 18,169190,847125 x 171 x 1671

Try the factor calculator

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