270

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

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Ordinal	Two hundred [and] seventieth
Cardinal	Two hundred [and] seventy
Factorization
Roman numeral	CCLXX
Binary	100001110
Hexadecimal	10E

In mathematics

• 270 is a harmonic divisor number
• 270 is the fourth number that is divisible by its average integer divisor (sequence A007340 in OEIS)
• 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 A003483
• 10! has 270 divisors
• 270 is a Harshad number in base 10

In other fields

• 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 President of the United States
• The average amount of days in human pregnancy
• A pseudonym for Konami musician Naoki Maeda
• One of a number of secondary Interstate highways connecting to Interstate 70: Interstate 270

271-279

• Two hundred [and] seventy-one prime, twin prime with 269, cuban prime, centered hexagonal number

• Two hundred [and] seventy-two 272 = 2⁴·17, sum of four consecutive primes (61 + 67 + 71 + 73), Euler number, primitive semiperfect number, pronic number

• Two hundred [and] seventy-three has its own article.

• Two hundred [and] seventy-four = 2·137, tribonacci number, Smith number, nontotient, noncototient, centered triangular number

• Two hundred [and] seventy-five 275 = 5²·11

• Two hundred [and] seventy-six 276 = 2²·3·23, triangular number, hexagonal number, centered pentagonal number, untouchable number, the lowest number whose aliquot sequence has not been fully determined (as of 2006)

• Two hundred [and] seventy-seven Perrin number, self number

• Two hundred [and] seventy-eight 278 = 2·139, nontotient

• Two hundred [and] seventy-nine 279 = 3²·31 Every positive integer is the sum of at most 279 eighth powers. See Waring's problem

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