Q: What are the prime factors of the number 74,331,240?

 A: 2, 3, 5, 313, 1979

Why are those the prime factors of the number 74,331,240?

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 74,331,240

74,331,240
Factor Arrows
237,165,620
Factor Arrows
218,582,810
Factor Arrows
29,291,405
Factor Arrows
33,097,135
Factor Arrows
5619,427
Factor Arrows
3131,979

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, 313, 1979

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 3 x 5 x 313 x 1,979 = 74,331,240

This can also be written as 23 x 31 x 51 x 3131 x 1,9791 = 74,331,240

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


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