Q: What are the prime factors of the number 7,205,760?

 A: 2, 3, 5, 139

Why are those the prime factors of the number 7,205,760?

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 7,205,760

7,205,760
Factor Arrows
23,602,880
Factor Arrows
21,801,440
Factor Arrows
2900,720
Factor Arrows
2450,360
Factor Arrows
2225,180
Factor Arrows
2112,590
Factor Arrows
256,295
Factor Arrows
318,765
Factor Arrows
36,255
Factor Arrows
32,085
Factor Arrows
3695
Factor Arrows
5139

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, 139

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 3 x 3 x 3 x 5 x 139 = 7,205,760

This can also be written as 27 x 34 x 51 x 1391 = 7,205,760

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


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