Fatto generale: 54 is the number of cards in a deck of playing cards, if two jokers are included.
Fatto matematico: 54 is the smallest number that can be written as the sum of 3 squares in 3 ways.
Trivia: 54 is the score in golf colloquially referred to as a perfect round.
Data storica: February 23rd is the day in 1886 that Charles Martin Hall produced the first samples of man-made aluminum, after several years of intensive work.