Fatto generale: 2690 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2690 is the number of terms in the 9^{th} derivative of f(f(f(f(f(x))))).
Trivia: 2690 is a boring number.
Data storica: May 13th is the day in 1515 that Mary Tudor, Queen of France and Charles Brandon, 1st Duke of Suffolk are officially married at Greenwich.