Q: What are the prime factors of the number 30,961,920?

 A: 2, 3, 5, 11, 733

Why are those the prime factors of the number 30,961,920?

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 30,961,920

30,961,920
Factor Arrows
215,480,960
Factor Arrows
27,740,480
Factor Arrows
23,870,240
Factor Arrows
21,935,120
Factor Arrows
2967,560
Factor Arrows
2483,780
Factor Arrows
2241,890
Factor Arrows
2120,945
Factor Arrows
340,315
Factor Arrows
58,063
Factor Arrows
11733

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, 11, 733

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 3 x 5 x 11 x 733 = 30,961,920

This can also be written as 28 x 31 x 51 x 111 x 7331 = 30,961,920

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


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