Q: What is the prime factorization of the number 97,968,740?

 A:
  • The prime factors are: 2 x 2 x 5 x 67 x 113 x 647
    • or also written as { 2, 2, 5, 67, 113, 647 }
  • Written in exponential form: 22 x 51 x 671 x 1131 x 6471

Why is the prime factorization of 97,968,740 written as 22 x 51 x 671 x 1131 x 6471?

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 97,968,740

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 97,968,740 by 2

97,968,740 ÷ 2 = 48,984,370 - No remainder! 2 is one of the factors!
48,984,370 ÷ 2 = 24,492,185 - No remainder! 2 is one of the factors!
24,492,185 ÷ 2 = 12,246,092.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
24,492,185 ÷ 3 = 8,164,061.6667 - This has a remainder. 3 is not a factor.
24,492,185 ÷ 5 = 4,898,437 - No remainder! 5 is one of the factors!
4,898,437 ÷ 5 = 979,687.4 - There is a remainder. We can't divide by 5 evenly anymore. Let's try the next prime number
4,898,437 ÷ 7 = 699,776.7143 - This has a remainder. 7 is not a factor.
4,898,437 ÷ 11 = 445,312.4545 - This has a remainder. 11 is not a factor.
4,898,437 ÷ 13 = 376,802.8462 - This has a remainder. 13 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
4,898,437 ÷ 67 = 73,111 - No remainder! 67 is one of the factors!
73,111 ÷ 67 = 1,091.209 - There is a remainder. We can't divide by 67 evenly anymore. Let's try the next prime number
73,111 ÷ 71 = 1,029.7324 - This has a remainder. 71 is not a factor.
73,111 ÷ 73 = 1,001.5205 - This has a remainder. 73 is not a factor.
73,111 ÷ 79 = 925.4557 - This has a remainder. 79 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
73,111 ÷ 113 = 647 - No remainder! 113 is one of the factors!
647 ÷ 113 = 5.7257 - There is a remainder. We can't divide by 113 evenly anymore. Let's try the next prime number
647 ÷ 127 = 5.0945 - This has a remainder. 127 is not a factor.
647 ÷ 131 = 4.9389 - This has a remainder. 131 is not a factor.
647 ÷ 137 = 4.7226 - This has a remainder. 137 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
647 ÷ 647 = 1 - No remainder! 647 is one of the factors!

The orange divisor(s) above are the prime factors of the number 97,968,740. If we put all of it together we have the factors 2 x 2 x 5 x 67 x 113 x 647 = 97,968,740. It can also be written in exponential form as 22 x 51 x 671 x 1131 x 6471.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 97,968,740.

97,968,740
Factor Arrows
248,984,370
Factor Arrows
224,492,185
Factor Arrows
54,898,437
Factor Arrows
6773,111
Factor Arrows
113647

More Prime Factorization Examples

97,968,73897,968,73997,968,74197,968,742
21 x 31 x 72 x 333,2271112 x 171 x 971 x 491131 x 131 x 2,512,019121 x 311 x 1,580,1411

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