Q: What are the prime factors of the number 11,237,856?

 A: 2, 3, 7, 2389

Why are those the prime factors of the number 11,237,856?

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 11,237,856

11,237,856
Factor Arrows
25,618,928
Factor Arrows
22,809,464
Factor Arrows
21,404,732
Factor Arrows
2702,366
Factor Arrows
2351,183
Factor Arrows
3117,061
Factor Arrows
716,723
Factor Arrows
72,389

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, 7, 2389

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 3 x 7 x 7 x 2,389 = 11,237,856

This can also be written as 25 x 31 x 72 x 2,3891 = 11,237,856

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


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