Hecho general: 704 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 704 is the number of sided octominoes.
Trivia: 704 is a boring number.
Fecha histórica: December 4th is the day in 1937 that the first issue of the children's comic, The Dandy Comic, is published, one of the first to use speech balloons.