Q: What are the prime factors of the number 404,234,320?

 A: 2, 5, 7, 101, 1021

Why are those the prime factors of the number 404,234,320?

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 404,234,320

404,234,320
Factor Arrows
2202,117,160
Factor Arrows
2101,058,580
Factor Arrows
250,529,290
Factor Arrows
225,264,645
Factor Arrows
55,052,929
Factor Arrows
7721,847
Factor Arrows
7103,121
Factor Arrows
1011,021

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, 7, 101, 1021

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 5 x 7 x 7 x 101 x 1,021 = 404,234,320

This can also be written as 24 x 51 x 72 x 1011 x 1,0211 = 404,234,320

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


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