Hecho general: 2773 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 2773 is the smallest number that can not be written as the sum of 3 volumes of rectangular boxes with integer dimensions less than 12.
Trivia: 2773 is an unremarkable number.
Fecha histórica: August 4th is the day in 1863 that Matica slovenská, Slovakia's public-law cultural and scientific institution focusing on topics around the Slovak nation, is established in Martin.