Fatto matematico: 4619 is a value of n for which 4n and 5n together use each digit exactly once.
Trivia: 4619 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: August 23rd is the day in 2011 that a 5.8 earthquake occurred in Mineral, Virginia, the earthquake was felt as far north as Ontario and as far south as Atlanta, Georgia.