Q: What are the prime factors of the number 15,421,504?

 A: 2, 7, 29, 1187

Why are those the prime factors of the number 15,421,504?

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 15,421,504

15,421,504
Factor Arrows
27,710,752
Factor Arrows
23,855,376
Factor Arrows
21,927,688
Factor Arrows
2963,844
Factor Arrows
2481,922
Factor Arrows
2240,961
Factor Arrows
734,423
Factor Arrows
291,187

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, 7, 29, 1187

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 7 x 29 x 1,187 = 15,421,504

This can also be written as 26 x 71 x 291 x 1,1871 = 15,421,504

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


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