Q: What are the prime factors of the number 61,331,520?

 A: 2, 3, 5, 29, 2203

Why are those the prime factors of the number 61,331,520?

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 61,331,520

61,331,520
Factor Arrows
230,665,760
Factor Arrows
215,332,880
Factor Arrows
27,666,440
Factor Arrows
23,833,220
Factor Arrows
21,916,610
Factor Arrows
2958,305
Factor Arrows
3319,435
Factor Arrows
563,887
Factor Arrows
292,203

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, 29, 2203

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 3 x 5 x 29 x 2,203 = 61,331,520

This can also be written as 26 x 31 x 51 x 291 x 2,2031 = 61,331,520

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


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