Q: What are the prime factors of the number 3,640,448?

 A: 2, 7, 17, 239

Why are those the prime factors of the number 3,640,448?

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 3,640,448

3,640,448
Factor Arrows
21,820,224
Factor Arrows
2910,112
Factor Arrows
2455,056
Factor Arrows
2227,528
Factor Arrows
2113,764
Factor Arrows
256,882
Factor Arrows
228,441
Factor Arrows
74,063
Factor Arrows
17239

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, 17, 239

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 7 x 17 x 239 = 3,640,448

This can also be written as 27 x 71 x 171 x 2391 = 3,640,448

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


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