Q: What are the prime factors of the number 39,251,968?

 A: 2, 7, 37

Why are those the prime factors of the number 39,251,968?

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 39,251,968

39,251,968
Factor Arrows
219,625,984
Factor Arrows
29,812,992
Factor Arrows
24,906,496
Factor Arrows
22,453,248
Factor Arrows
21,226,624
Factor Arrows
2613,312
Factor Arrows
2306,656
Factor Arrows
2153,328
Factor Arrows
276,664
Factor Arrows
238,332
Factor Arrows
219,166
Factor Arrows
29,583
Factor Arrows
71,369
Factor Arrows
3737

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, 37

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 2 x 2 x 7 x 37 x 37 = 39,251,968

This can also be written as 212 x 71 x 372 = 39,251,968

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


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