Fait mathématique: 5440 is the number of ways to legally add 2 sets of parentheses to a product of 15 variables.
Culture générale: 5440 is an unremarkable number.
Date historique: November 22nd is the day in 845 that the first King of all Brittany, Nominoe defeats the Frankish king Charles the Bald at the Battle of Ballon near Redon.