Fatto generale: 61864 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 61864 is an uninteresting number.
Trivia: 61864 is an uninteresting number.
Data storica: May 17th is the day in 1914 that the Protocol of Corfu is signed recognising full autonomy to Northern Epirus under nominal Albanian sovereignty.