Hecho matemático: 86847 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 86847 is an unremarkable number.
Fecha histórica: October 11th is the day in 1634 that the Burchardi flood – "the second Grote Mandrenke" killed around 15,000 men in North Friesland, Denmark and Germany.