Q: What are the prime factors of the number 858,735?

 A: 3, 5, 6361

Why are those the prime factors of the number 858,735?

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 858,735

858,735
Factor Arrows
3286,245
Factor Arrows
395,415
Factor Arrows
331,805
Factor Arrows
56,361

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:

3, 5, 6361

We can check our work by multiplying all of the prime factors together: 3 x 3 x 3 x 5 x 6,361 = 858,735

This can also be written as 33 x 51 x 6,3611 = 858,735

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


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