268689 has 4 divisors (see below), whose sum is σ = 358256. Its totient is φ = 179124.

The previous prime is 268661. The next prime is 268693. The reversal of 268689 is 986862.

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 not a de Polignac number, because 268689 - 2¹¹ = 266641 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (268189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44779 + ... + 44784.

It is an arithmetic number, because the mean of its divisors is an integer number (89564).

2²⁶⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

268689 is a deficient number, since it is larger than the sum of its proper divisors (89567).

268689 is an equidigital number, since it uses as much as digits as its factorization.

268689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89566.

The product of its digits is 41472, while the sum is 39.

The square root of 268689 is about 518.3521968700. The cubic root of 268689 is about 64.5282611566.

It can be divided in two parts, 2686 and 89, that added together give a triangular number (2775 = T₇₄).

The spelling of 268689 in words is "two hundred sixty-eight thousand, six hundred eighty-nine".