Q: What are the prime factors of the number 312,021,120?

 A: 2, 3, 5, 163, 997

Why are those the prime factors of the number 312,021,120?

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 312,021,120

312,021,120
Factor Arrows
2156,010,560
Factor Arrows
278,005,280
Factor Arrows
239,002,640
Factor Arrows
219,501,320
Factor Arrows
29,750,660
Factor Arrows
24,875,330
Factor Arrows
22,437,665
Factor Arrows
3812,555
Factor Arrows
5162,511
Factor Arrows
163997

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, 163, 997

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 3 x 5 x 163 x 997 = 312,021,120

This can also be written as 27 x 31 x 51 x 1631 x 9971 = 312,021,120

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


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