**722**= 2 x 19 x 19.

**722**has a representation as a sum of two squares:

**722**= 19

^{2}+ 19

^{2}.

**722**is the sum of the fourth powers of the first three primes (A133531):

**722**= 2

^{4}+ 3

^{4}+ 5

^{4}.

**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?