Fatto generale: 61728 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 61728 is an unremarkable number.
Trivia: 61728 is an uninteresting number.
Data storica: January 1st is the day in 1812 that the Bishop of Durham, Shute Barrington, orders troops from Durham Castle to break up a miners strike in Chester-le-Street, Co. Durham.