General fact: 47770 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 47770 is an uninteresting number.
Trivia: 47770 is an unremarkable number.
Historical date: October 15th is the day in 1969 that Vietnam War; The Moratorium to End the War in Vietnam is held in Washington DC and across the US.