General fact: 47 is the number of phonemes in English phonology in Received Pronunciation.
Mathematical fact: 47 is the fifteenth prime number, a safe prime, the thirteenth supersingular prime, and the sixth Lucas prime.
Trivia: 47 is the total numbers of balloons that a player can collect in Rareware's Nintendo 64 game Diddy Kong Racing.
Historical date: February 16th is the day in 1987 that the trial of John Demjanjuk, accused of being a Nazi guard dubbed "Ivan the Terrible" in Treblinka extermination camp, starts in Jerusalem.