Fatto generale: 9780 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9780 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 9780 is an unremarkable number.
Data storica: October 10th is the day in 1945 that the Chinese Communist Party and the Kuomintang signed a principle agreement in Chongqing about the future of post-war China.