Q: What are the prime factors of the number 86,235,072?

 A: 2, 3, 7, 11, 19, 307

Why are those the prime factors of the number 86,235,072?

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 86,235,072

86,235,072
Factor Arrows
243,117,536
Factor Arrows
221,558,768
Factor Arrows
210,779,384
Factor Arrows
25,389,692
Factor Arrows
22,694,846
Factor Arrows
21,347,423
Factor Arrows
3449,141
Factor Arrows
764,163
Factor Arrows
115,833
Factor Arrows
19307

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, 11, 19, 307

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 3 x 7 x 11 x 19 x 307 = 86,235,072

This can also be written as 26 x 31 x 71 x 111 x 191 x 3071 = 86,235,072

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


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