Q: What are the prime factors of the number 108,856,440?

 A: 2, 3, 5, 7, 11, 17

Why are those the prime factors of the number 108,856,440?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 108,856,440

108,856,440
Factor Arrows
254,428,220
Factor Arrows
227,214,110
Factor Arrows
213,607,055
Factor Arrows
34,535,685
Factor Arrows
31,511,895
Factor Arrows
3503,965
Factor Arrows
5100,793
Factor Arrows
714,399
Factor Arrows
72,057
Factor Arrows
11187
Factor Arrows
1117

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 3, 5, 7, 11, 17

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 3 x 3 x 3 x 5 x 7 x 7 x 11 x 11 x 17 = 108,856,440

This can also be written as 23 x 33 x 51 x 72 x 112 x 171 = 108,856,440

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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