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273 (two hundred [and] seventy-three) is the natural number following 272 and preceding 274.
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| Cardinal | two hundred seventy-three | |||
| Ordinal | 273rd (two hundred seventy-third) | |||
| Factorization | 3 × 7 × 13 | |||
| Greek numeral | ΣΟΓ´ | |||
| Roman numeral | CCLXXIII, cclxxiii | |||
| Binary | 1000100012 | |||
| Ternary | 1010103 | |||
| Senary | 11336 | |||
| Octal | 4218 | |||
| Duodecimal | 1A912 | |||
| Hexadecimal | 11116 | |||
273 is a sphenic number (A007304), a lucky number (A000959), a truncated triangular pyramid number (A051937), and an idoneal number (A000926). There are 273 different ternary trees with five nodes (A001764). It is in the Moser–de Bruijn sequence (A000695), comprising the sum 44+42+40, and is a central polygonal number (A002061).
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