Q: What are the prime factors of the number 11,185,790?

 A: 2, 5, 7, 11, 73, 199

Why are those the prime factors of the number 11,185,790?

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 11,185,790

11,185,790
Factor Arrows
25,592,895
Factor Arrows
51,118,579
Factor Arrows
7159,797
Factor Arrows
1114,527
Factor Arrows
73199

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, 5, 7, 11, 73, 199

We can check our work by multiplying all of the prime factors together: 2 x 5 x 7 x 11 x 73 x 199 = 11,185,790

This can also be written as 21 x 51 x 71 x 111 x 731 x 1991 = 11,185,790

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


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