Q: What are the prime factors of the number 61,751,872?

 A: 2, 7, 13, 23, 461

Why are those the prime factors of the number 61,751,872?

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 61,751,872

61,751,872
Factor Arrows
230,875,936
Factor Arrows
215,437,968
Factor Arrows
27,718,984
Factor Arrows
23,859,492
Factor Arrows
21,929,746
Factor Arrows
2964,873
Factor Arrows
7137,839
Factor Arrows
1310,603
Factor Arrows
23461

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, 13, 23, 461

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 7 x 13 x 23 x 461 = 61,751,872

This can also be written as 26 x 71 x 131 x 231 x 4611 = 61,751,872

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


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