Q: What are the prime factors of the number 85,986,780?

 A: 2, 3, 5, 11, 19, 6857

Why are those the prime factors of the number 85,986,780?

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 85,986,780

85,986,780
Factor Arrows
242,993,390
Factor Arrows
221,496,695
Factor Arrows
37,165,565
Factor Arrows
51,433,113
Factor Arrows
11130,283
Factor Arrows
196,857

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, 5, 11, 19, 6857

We can check our work by multiplying all of the prime factors together: 2 x 2 x 3 x 5 x 11 x 19 x 6,857 = 85,986,780

This can also be written as 22 x 31 x 51 x 111 x 191 x 6,8571 = 85,986,780

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


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