Q: What are the prime factors of the number 261,780,050?

 A: 2, 5, 7, 59, 1811

Why are those the prime factors of the number 261,780,050?

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 261,780,050

261,780,050
Factor Arrows
2130,890,025
Factor Arrows
526,178,005
Factor Arrows
55,235,601
Factor Arrows
7747,943
Factor Arrows
7106,849
Factor Arrows
591,811

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, 7, 59, 1811

We can check our work by multiplying all of the prime factors together: 2 x 5 x 5 x 7 x 7 x 59 x 1,811 = 261,780,050

This can also be written as 21 x 52 x 72 x 591 x 1,8111 = 261,780,050

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


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