Fatto generale: 7673 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 7673 is the smallest number with the property that its first 8 multiples contain the digit 3.
Trivia: 7673 is a boring number.
Data storica: January 2nd is the day in 1860 that the discovery of the planet Vulcan is announced at a meeting of the French Academy of Sciences in Paris, France.