Fait général: 2878 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2878 is the number of integers with complexity 28.
Culture générale: 2878 is a boring number.
Date historique: November 17th is the day in 1810 that Sweden declares war on its ally the United Kingdom to begin the Anglo-Swedish War, although no fighting ever takes place.