Fatto generale: 84 is the code for international direct dial phone calls to Vietnam.
Fatto matematico: 84 is the sum of the first seven triangular numbers (making it a tetrahedral number), as well as the sum of a twin prime (41 + 43).
Trivia: 84 is the code for international direct dial phone calls to Vietnam.
Data storica: March 24th is the day in 1933 that the Enabling Act of 1933 is passed by the German Reichstag, allowing Adolf Hitler to gain plenary power.