268665 has 8 divisors (see below), whose sum is σ = 429888. Its totient is φ = 143280.

The previous prime is 268661. The next prime is 268693. The reversal of 268665 is 566862.

268665 = T₈₆ + T₈₇ + ... + T₁₃₀.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 268665 - 2² = 268661 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (268661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8941 + ... + 8970.

It is an arithmetic number, because the mean of its divisors is an integer number (53736).

2²⁶⁸⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

268665 is a deficient number, since it is larger than the sum of its proper divisors (161223).

268665 is a wasteful number, since it uses less digits than its factorization.

268665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17919.

The product of its digits is 17280, while the sum is 33.

The square root of 268665 is about 518.3290460702. The cubic root of 268665 is about 64.5263398221.

The spelling of 268665 in words is "two hundred sixty-eight thousand, six hundred sixty-five".