Hecho matemático: 689 is the smallest number that can be written as the sum of 3 distinct squares in 9 ways.
Trivia: 689 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: November 19th is the day in 1990 that Pop group Milli Vanilli are stripped of their Grammy Award because the duo did not sing at all on the Girl You Know It's True album.