270 (number)

← 269 270 271 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred seventy
Ordinal	270th (two hundred seventieth)
Factorization	2 × 33 × 5
Greek numeral	ΣΟ´
Roman numeral	CCLXX
Binary	1000011102
Ternary	1010003
Senary	11306
Octal	4168
Duodecimal	1A612
Hexadecimal	10E16

270 (two hundred [and] seventy) is the natural number following 269 and preceding 271.

In mathematics

• 270 is a harmonic divisor number
• 270 is the fourth number that is divisible by its average integer divisor
• 270 is a practical number, by the second definition
• The sum of the coprime counts for the first 29 integers is 270
• 270 is a sparsely totient number, the largest integer with 72 as its totient
• Given 6 elements, there are 270 square permutations
• 10! has 270 divisors
• 270 is a Harshad number in base 10
• 270 is the smallest positive integer that has divisors ending by digits 1, 2, …, 9.

In other fields

See also: List of highways numbered 270

• The year 270 BC
• The year 270 AD
• The caliber of the .270 Winchester rifle
• The number of U.S. Electoral College votes needed to be elected President of the United States
• The average number of days in human pregnancy
• A pseudonym for Konami musician Naoki Maeda

Integers from 271 to 279

271

Main article: 271 (number)

272

272 = 2⁴·17, sum of four consecutive primes (61 + 67 + 71 + 73), Euler number, primitive semiperfect number, pronic number

273

Main article: 273 (number)

274

274 = 2·137, tribonacci number, Smith number, nontotient, noncototient, centered triangular number

275

275 = 5²·11

276

Main article: 276 (number)

277

Main article: 277 (number)

278

278 = 2·139, nontotient

279

279 = 3²·31 Every positive integer is the sum of at most 279 eighth powers. See Waring's problem.