Q: What are the prime factors of the number 785,081,248?

 A: 2, 7, 197, 17791

Why are those the prime factors of the number 785,081,248?

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 785,081,248

785,081,248
Factor Arrows
2392,540,624
Factor Arrows
2196,270,312
Factor Arrows
298,135,156
Factor Arrows
249,067,578
Factor Arrows
224,533,789
Factor Arrows
73,504,827
Factor Arrows
19717,791

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, 197, 17791

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 7 x 197 x 17,791 = 785,081,248

This can also be written as 25 x 71 x 1971 x 17,7911 = 785,081,248

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


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