264815 has 4 divisors (see below), whose sum is σ = 317784. Its totient is φ = 211848.

The previous prime is 264811. The next prime is 264827. The reversal of 264815 is 518462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 264815 - 2² = 264811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 264815.

It is not an unprimeable number, because it can be changed into a prime (264811) 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, 26477 + ... + 26486.

It is an arithmetic number, because the mean of its divisors is an integer number (79446).

2²⁶⁴⁸¹⁵ is an apocalyptic number.

264815 is a deficient number, since it is larger than the sum of its proper divisors (52969).

264815 is an equidigital number, since it uses as much as digits as its factorization.

264815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52968.

The product of its digits is 1920, while the sum is 26.

The square root of 264815 is about 514.6017877932. The cubic root of 264815 is about 64.2166324339.

The spelling of 264815 in words is "two hundred sixty-four thousand, eight hundred fifteen".