Q: What are the prime factors of the number 28,201,920?

 A: 2, 3, 5, 29, 1013

Why are those the prime factors of the number 28,201,920?

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 28,201,920

28,201,920
Factor Arrows
214,100,960
Factor Arrows
27,050,480
Factor Arrows
23,525,240
Factor Arrows
21,762,620
Factor Arrows
2881,310
Factor Arrows
2440,655
Factor Arrows
3146,885
Factor Arrows
529,377
Factor Arrows
291,013

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, 29, 1013

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 3 x 5 x 29 x 1,013 = 28,201,920

This can also be written as 26 x 31 x 51 x 291 x 1,0131 = 28,201,920

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


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