Fatto matematico: 7768 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 7768 is an unremarkable number.
Data storica: April 7th is the day in 1829 that Joseph Smith, Jr., founder of the Latter Day Saint movement, commences translation of the Book of Mormon, with Oliver Cowdery as his scribe.