270 (number)

270 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

It may also refer to:

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

In other numbers:

• Two hundred [and] seventy-one (271), 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 (273), = 3·7·13, 3th 92-figurate number, Sphenic number
• Two hundred [and] seventy-four (274), = 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 (277), 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

[edit] See also

• 273 (number)

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