Fatto generale: 735 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 735 is the smallest number that is the concatenation of its distinct prime factors.
Trivia: 735 is a boring number.
Data storica: January 4th is the day in 1998 that a massive ice storm hits eastern Canada and the northeastern United States, continuing through January 10 and causing widespread destruction.