Q: What are the prime factors of the number 15,174,656?

 A: 2, 7, 29, 73

Why are those the prime factors of the number 15,174,656?

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 15,174,656

15,174,656
Factor Arrows
27,587,328
Factor Arrows
23,793,664
Factor Arrows
21,896,832
Factor Arrows
2948,416
Factor Arrows
2474,208
Factor Arrows
2237,104
Factor Arrows
2118,552
Factor Arrows
259,276
Factor Arrows
229,638
Factor Arrows
214,819
Factor Arrows
72,117
Factor Arrows
2973

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, 7, 29, 73

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 7 x 29 x 73 = 15,174,656

This can also be written as 210 x 71 x 291 x 731 = 15,174,656

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


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