Fatto generale: 61878 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 61878 is an uninteresting number.
Trivia: 61878 is an unremarkable number.
Data storica: May 31st is the day in 1578 that Martin Frobisher sails from Harwich, England to Frobisher Bay, Canada, eventually to mine fool's gold, used to pave streets in London.