Fatto generale: 7689 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 7689 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 7689 is an uninteresting number.
Data storica: January 18th is the day in 1778 that James Cook is the first known European to discover the Hawaiian Islands, which he names the "Sandwich Islands.