Fatto matematico: 741 is the number of multigraphs with 6 vertices and 8 edges.
Trivia: 741 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: January 10th is the day in 1863 that the London Underground, the world's oldest underground railway, opens between London Paddington station and Farringdon station.