272

272 is a natural number that comes after 271 and before 273. It is even and composite.

Its prime factorization is 2^4 × 17. The positive divisors are 1, 2, 4, 8, 16, 17, 34, 68, 136, and 272. The sum of all divisors is 558, so the sum of proper divisors is 286; thus 272 is an abundant number.

Because 17 is a Fermat prime (2^4 + 1), 272 = 2^4 × 17. The totient φ(272) equals 272 × (1/2) × (16/17) = 128.

In common numeral systems, 272 is written as binary 100010000, octal 420, and hexadecimal 0x110. In Roman numerals it is CCLXXII.

As a number with the form 2^n × FermatPrime, 272 is sometimes cited in discussions of factorization patterns and divisor sums. Its simple factorization and explicit divisors make it a convenient example in introductory number theory.