672

672 = 2⁵ x 3 x 7.

672 has a unique representation as a sum of three squares: 672 = 4² + 16² + 20².

672⁶⁷² plus the 672nd prime is a prime number.

672 is a multiperfect number.

672 x 276 = 185,472 = 384 x 483.

672 is the number of hours in February of a non-leap year.

Source: Prime Curios!