268609 has 4 divisors (see below), whose sum is σ = 293040. Its totient is φ = 244180.

The previous prime is 268607. The next prime is 268613. The reversal of 268609 is 906862.

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 268609 - 2¹ = 268607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (268607) 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, 12199 + ... + 12220.

It is an arithmetic number, because the mean of its divisors is an integer number (73260).

2²⁶⁸⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

268609 is a deficient number, since it is larger than the sum of its proper divisors (24431).

268609 is a wasteful number, since it uses less digits than its factorization.

268609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24430.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 268609 is about 518.2750235155. The cubic root of 268609 is about 64.5218562631.

The spelling of 268609 in words is "two hundred sixty-eight thousand, six hundred nine".