Fatto generale: 8641 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8641 is the number of ways to tile a 3×25 rectangle with 3×1 rectangles.
Trivia: 8641 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: August 28th is the day in 1830 that the Baltimore and Ohio Railroad's new Tom Thumb steam locomotive races a horse-drawn car, presaging steam's role in US railroading.