Because 5 is one of its factors, 670 is the hypotenuse of the Pythagorean triple 402-536-670. Which factor of 670 is the greatest common factor of those three numbers?

Print the puzzles or type the solution on this excel file: 12 Factors 2015-11-02

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- 670 is a composite number.
- Prime factorization: 670 = 2 x 5 x 67
- The exponents in the prime factorization are 1, 1, and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1)(1 + 1) = 2 x 2 x 2 = 8. Therefore 670 has exactly 8 factors.
- Factors of 670: 1, 2, 5, 10, 67, 134, 335, 670
- Factor pairs: 670 = 1 x 670, 2 x 335, 5 x 134, or 10 x 67
- 670 has no square factors that allow its square root to be simplified. √670 ≈ 25.884358.

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Thank you, Ricardo, for tweeting the solution:

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```@findthefactors around 60 minutes but done 🙂 pic.twitter.com/L2dYop4Qcy

— riccardo (@ricca9380) November 7, 2015