Q: What are the prime factors of the number 70,988,940?

 A: 2, 3, 5, 11, 17, 19, 37

Why are those the prime factors of the number 70,988,940?

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 70,988,940

70,988,940
Factor Arrows
235,494,470
Factor Arrows
217,747,235
Factor Arrows
35,915,745
Factor Arrows
31,971,915
Factor Arrows
3657,305
Factor Arrows
5131,461
Factor Arrows
1111,951
Factor Arrows
17703
Factor Arrows
1937

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, 17, 19, 37

We can check our work by multiplying all of the prime factors together: 2 x 2 x 3 x 3 x 3 x 5 x 11 x 17 x 19 x 37 = 70,988,940

This can also be written as 22 x 33 x 51 x 111 x 171 x 191 x 371 = 70,988,940

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


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