Q: What are the prime factors of the number 120,312,320?

 A: 2, 5, 46997

Why are those the prime factors of the number 120,312,320?

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 120,312,320

120,312,320
Factor Arrows
260,156,160
Factor Arrows
230,078,080
Factor Arrows
215,039,040
Factor Arrows
27,519,520
Factor Arrows
23,759,760
Factor Arrows
21,879,880
Factor Arrows
2939,940
Factor Arrows
2469,970
Factor Arrows
2234,985
Factor Arrows
546,997

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, 5, 46997

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 5 x 46,997 = 120,312,320

This can also be written as 29 x 51 x 46,9971 = 120,312,320

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


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