Q: What are the prime factors of the number 404,013,400?

 A: 2, 5, 7, 23, 12547

Why are those the prime factors of the number 404,013,400?

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 404,013,400

404,013,400
Factor Arrows
2202,006,700
Factor Arrows
2101,003,350
Factor Arrows
250,501,675
Factor Arrows
510,100,335
Factor Arrows
52,020,067
Factor Arrows
7288,581
Factor Arrows
2312,547

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, 23, 12547

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 5 x 5 x 7 x 23 x 12,547 = 404,013,400

This can also be written as 23 x 52 x 71 x 231 x 12,5471 = 404,013,400

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


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