816 = 24 x 3 x 17.
816 is the 16th tetrahedral number.
816/(8 x 1 x 6) = 816/48 = 17, a prime. 816 is the largest three-digit integer that has this property.
816 is 30300 in base 4 and 330 in base 16. It is 2244 in base 7 and 424 in base 14.
816 is a telephone area code that covers the Kansas City area in Missouri.
Source: Prime Curios!
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