264689 has 4 divisors (see below), whose sum is σ = 278640. Its totient is φ = 250740.

The previous prime is 264659. The next prime is 264697. The reversal of 264689 is 986462.

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, and also an emirpimes, since its reverse is a distinct semiprime: 986462 = 2 ⋅493231.

It is a cyclic number.

It is not a de Polignac number, because 264689 - 2¹⁶ = 199153 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 6³ + 6⁴ + 4⁹ + 8³ + 9 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264619) 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, 6947 + ... + 6984.

It is an arithmetic number, because the mean of its divisors is an integer number (69660).

2²⁶⁴⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

264689 is a deficient number, since it is larger than the sum of its proper divisors (13951).

264689 is a wasteful number, since it uses less digits than its factorization.

264689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13950.

The product of its digits is 20736, while the sum is 35.

The square root of 264689 is about 514.4793484679. The cubic root of 264689 is about 64.2064459776.

The spelling of 264689 in words is "two hundred sixty-four thousand, six hundred eighty-nine".