Hecho general: 87641 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 87641 is a boring number.
Trivia: 87641 is an uninteresting number.
Fecha histórica: December 14th is the day in 1913 that Haruna, the fourth and last ship of the Kongō-class, launches, eventually becoming one of the Japanese workhorses during World War I and World War II.