Q: What are the prime factors of the number 838,401,280?

 A: 2, 5, 655001

Why are those the prime factors of the number 838,401,280?

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 838,401,280

838,401,280
Factor Arrows
2419,200,640
Factor Arrows
2209,600,320
Factor Arrows
2104,800,160
Factor Arrows
252,400,080
Factor Arrows
226,200,040
Factor Arrows
213,100,020
Factor Arrows
26,550,010
Factor Arrows
23,275,005
Factor Arrows
5655,001

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, 5, 655001

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 2 x 5 x 655,001 = 838,401,280

This can also be written as 28 x 51 x 655,0011 = 838,401,280

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


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