Mathematical fact: 6781 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 6781 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: July 25th is the day in 315 that the Arch of Constantine is completed near the Colosseum at Rome to commemorate Constantine's victory over Maxentius at the Milvian Bridge.