268809 has 4 divisors (see below), whose sum is σ = 358416. Its totient is φ = 179204.

The previous prime is 268789. The next prime is 268811. The reversal of 268809 is 908862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 268809 - 2⁵ = 268777 is a prime.

It is a d-powerful number, because it can be written as 2² + 6² + 8² + 8⁶ + 0 + 9⁴ .

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 268809.

It is not an unprimeable number, because it can be changed into a prime (268819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44799 + ... + 44804.

It is an arithmetic number, because the mean of its divisors is an integer number (89604).

2²⁶⁸⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

268809 is a deficient number, since it is larger than the sum of its proper divisors (89607).

268809 is an equidigital number, since it uses as much as digits as its factorization.

268809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89606.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 268809 is about 518.4679353634. The cubic root of 268809 is about 64.5378661136.

The spelling of 268809 in words is "two hundred sixty-eight thousand, eight hundred nine".