Fait mathématique: 2780 is 1^{8} + 2^{7} + 3^{6} + 4^{5} + 5^{4} + 6^{3} + 7^{2} + 8^{1}.
Culture générale: 2780 is an unremarkable number.
Date historique: August 11th is the day in 1982 that a bomb explodes on Pan Am Flight 830, en route from Tokyo to Honolulu, killing one teenager and injuring 15 passengers.