Q: What are the prime factors of the number 261,355,776?

 A: 2, 3, 11, 30937

Why are those the prime factors of the number 261,355,776?

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 261,355,776

261,355,776
Factor Arrows
2130,677,888
Factor Arrows
265,338,944
Factor Arrows
232,669,472
Factor Arrows
216,334,736
Factor Arrows
28,167,368
Factor Arrows
24,083,684
Factor Arrows
22,041,842
Factor Arrows
21,020,921
Factor Arrows
3340,307
Factor Arrows
1130,937

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, 11, 30937

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 3 x 11 x 30,937 = 261,355,776

This can also be written as 28 x 31 x 111 x 30,9371 = 261,355,776

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


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