Friday, June 29, 2012

722

722 = 2 x 19 x 19.

722 has a representation as a sum of two squares: 722 = 192 + 192.

722 is the sum of the fourth powers of the first three primes (A133531): 722 = 24 + 34 + 54.

722 is the sum of two distinct factorials, the sum of the factorials of the digits of 26 (A061602): 722 = 2! + 6!

722 is the maximum number of regions into which the plane can be divided by 10 (concave) quadrilaterals (A077591).


Source: What's Special About This Number?

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