Fatto matematico: 7680 is the number of possible rook moves on a 16×16 chessboard.
Trivia: 7680 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: January 9th is the day in 475 that Byzantine Emperor Zeno is forced to flee his capital at Constantinople, and his general, Basiliscus gains control of the empire.