Fatto generale: 78 is the total number of gifts in the song The Twelve Days of Christmas.
Fatto matematico: 78 is a triangular number, and its factorization makes it a sphenic number.
Trivia: 78 is the total number of gifts in the song The Twelve Days of Christmas.
Data storica: March 18th is the day in 235 that Emperor Alexander Severus and his mother Julia Mamaea are murdered by legionaries near Moguntiacum (modern Mainz).