Fatto generale: 8728 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8728 is an unremarkable number.
Trivia: 8728 is a boring number.
Data storica: November 23rd is the day in 1867 that the Manchester Martyrs are hanged in Manchester, England for killing a police officer while freeing two Irish nationalists from custody.