Q: What are the prime factors of the number 311,313,408?

 A: 2, 3, 7, 31, 467

Why are those the prime factors of the number 311,313,408?

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 311,313,408

311,313,408
Factor Arrows
2155,656,704
Factor Arrows
277,828,352
Factor Arrows
238,914,176
Factor Arrows
219,457,088
Factor Arrows
29,728,544
Factor Arrows
24,864,272
Factor Arrows
22,432,136
Factor Arrows
21,216,068
Factor Arrows
2608,034
Factor Arrows
2304,017
Factor Arrows
3101,339
Factor Arrows
714,477
Factor Arrows
31467

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, 7, 31, 467

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 2 x 3 x 7 x 31 x 467 = 311,313,408

This can also be written as 210 x 31 x 71 x 311 x 4671 = 311,313,408

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


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