Q: What are the prime factors of the number 34,721,792?

 A: 2, 7, 173

Why are those the prime factors of the number 34,721,792?

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 34,721,792

34,721,792
Factor Arrows
217,360,896
Factor Arrows
28,680,448
Factor Arrows
24,340,224
Factor Arrows
22,170,112
Factor Arrows
21,085,056
Factor Arrows
2542,528
Factor Arrows
2271,264
Factor Arrows
2135,632
Factor Arrows
267,816
Factor Arrows
233,908
Factor Arrows
216,954
Factor Arrows
28,477
Factor Arrows
71,211
Factor Arrows
7173

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, 173

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 2 x 7 x 7 x 173 = 34,721,792

This can also be written as 212 x 72 x 1731 = 34,721,792

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


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