Q: What are the prime factors of the number 30,376,640?

 A: 2, 5, 7, 71, 191

Why are those the prime factors of the number 30,376,640?

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 30,376,640

30,376,640
Factor Arrows
215,188,320
Factor Arrows
27,594,160
Factor Arrows
23,797,080
Factor Arrows
21,898,540
Factor Arrows
2949,270
Factor Arrows
2474,635
Factor Arrows
594,927
Factor Arrows
713,561
Factor Arrows
71191

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, 5, 7, 71, 191

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 5 x 7 x 71 x 191 = 30,376,640

This can also be written as 26 x 51 x 71 x 711 x 1911 = 30,376,640

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


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