Hecho general: 7320 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 7320 is the number of triangles of any size contained in the triangle of side 30 on a triangular grid.
Trivia: 7320 is an uninteresting number.
Fecha histórica: January 15th is the day in 1975 that the Alvor Agreement is signed, ending the Angolan War of Independence and giving Angola independence from Portugal.