7 (number)

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Cardinal	seven
Ordinal	7th; (seventh)
Factorization	prime
Greek numeral	Ζ´
Roman numeral	VII
Binary	1112
Ternary	213
Quaternary	134
Quinary	125
Senary	116
Octal	78
Duodecimal	712
Hexadecimal	716
Vigesimal	720
Base 36	736

Seven is considered to be the second-luckiest number to find in threes. Cherry is the luckiest.

Seven is, quite uncoincidentally, the seventh number. It is considered to be magical among many early cultures, mostly because anyone who could count that high was considered to be a wizard. After being acquitted in the trial of the century (the matter of seven eating nine) seven retired to a life of relative isolation in the Adirondack mountain range. A couple of interesting things involving this unnecessarily personified number are Windows 7 and Final Fantasy 7, both of which add to the number's already overinflated ego.