Fatto generale: 6634 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6634 is an unremarkable number.
Trivia: 6634 is an unremarkable number.
Data storica: February 28th is the day in 1958 that a school bus in Floyd County, Kentucky hits a wrecker truck and plunges down an embankment into the rain-swollen Levisa Fork River.