264781 has 4 divisors (see below), whose sum is σ = 288864. Its totient is φ = 240700.

The previous prime is 264779. The next prime is 264787. The reversal of 264781 is 187462.

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 264781 - 2¹ = 264779 is a prime.

It is a super-2 number, since 2×264781² = 140217955922, which contains 22 as substring.

It is a Duffinian number.

264781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264787) 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, 12025 + ... + 12046.

It is an arithmetic number, because the mean of its divisors is an integer number (72216).

2²⁶⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

264781 is a deficient number, since it is larger than the sum of its proper divisors (24083).

264781 is a wasteful number, since it uses less digits than its factorization.

264781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24082.

The product of its digits is 2688, while the sum is 28.

The square root of 264781 is about 514.5687514803. The cubic root of 264781 is about 64.2138840260.

The spelling of 264781 in words is "two hundred sixty-four thousand, seven hundred eighty-one".