Q: What are the prime factors of the number 818,581,568?

 A: 2, 7, 79, 101, 229

Why are those the prime factors of the number 818,581,568?

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 818,581,568

818,581,568
Factor Arrows
2409,290,784
Factor Arrows
2204,645,392
Factor Arrows
2102,322,696
Factor Arrows
251,161,348
Factor Arrows
225,580,674
Factor Arrows
212,790,337
Factor Arrows
71,827,191
Factor Arrows
7923,129
Factor Arrows
101229

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, 79, 101, 229

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 79 x 101 x 229 = 818,581,568

This can also be written as 26 x 71 x 791 x 1011 x 2291 = 818,581,568

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


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