Q: What are the prime factors of the number 13,223,040?

 A: 2, 3, 5, 71, 97

Why are those the prime factors of the number 13,223,040?

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 13,223,040

13,223,040
Factor Arrows
26,611,520
Factor Arrows
23,305,760
Factor Arrows
21,652,880
Factor Arrows
2826,440
Factor Arrows
2413,220
Factor Arrows
2206,610
Factor Arrows
2103,305
Factor Arrows
334,435
Factor Arrows
56,887
Factor Arrows
7197

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, 71, 97

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 3 x 5 x 71 x 97 = 13,223,040

This can also be written as 27 x 31 x 51 x 711 x 971 = 13,223,040

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


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