Q: What are the prime factors of the number 85,121,024?

 A: 2, 89, 467

Why are those the prime factors of the number 85,121,024?

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 85,121,024

85,121,024
Factor Arrows
242,560,512
Factor Arrows
221,280,256
Factor Arrows
210,640,128
Factor Arrows
25,320,064
Factor Arrows
22,660,032
Factor Arrows
21,330,016
Factor Arrows
2665,008
Factor Arrows
2332,504
Factor Arrows
2166,252
Factor Arrows
283,126
Factor Arrows
241,563
Factor Arrows
89467

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, 89, 467

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 2 x 2 x 2 x 2 x 2 x 89 x 467 = 85,121,024

This can also be written as 211 x 891 x 4671 = 85,121,024

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


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