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| Cardinal | seventy-three | |||
| Ordinal | 73rd (seventy-third) |
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| Factorization | prime | |||
| Prime | 21st | |||
| Divisors | 1, 73 | |||
| Greek numeral | ΟΓ´ | |||
| Roman numeral | LXXIII | |||
| Binary | 10010012 | |||
| Ternary | 22013 | |||
| Quaternary | 10214 | |||
| Quinary | 2435 | |||
| Senary | 2016 | |||
| Octal | 1118 | |||
| Duodecimal | 6112 | |||
| Hexadecimal | 4916 | |||
| Vigesimal | 3D20 | |||
| Base 36 | 2136 | |||
73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest natural number with twelve letters in its spelled out name.
73 is:
Also:
73 is also: