Q: What are the prime factors of the number 720,785,256?

 A: 2, 3, 29, 79, 13109

Why are those the prime factors of the number 720,785,256?

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 720,785,256

720,785,256
Factor Arrows
2360,392,628
Factor Arrows
2180,196,314
Factor Arrows
290,098,157
Factor Arrows
330,032,719
Factor Arrows
291,035,611
Factor Arrows
7913,109

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, 29, 79, 13109

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 3 x 29 x 79 x 13,109 = 720,785,256

This can also be written as 23 x 31 x 291 x 791 x 13,1091 = 720,785,256

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


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