264781605 has 16 divisors (see below), whose sum is σ = 462164544. Its totient is φ = 128378880.

The previous prime is 264781591. The next prime is 264781631. The reversal of 264781605 is 506187462.

It is not a de Polignac number, because 264781605 - 2¹⁶ = 264716069 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 802204 + ... + 802533.

It is an arithmetic number, because the mean of its divisors is an integer number (28885284).

Almost surely, 2^264781605 is an apocalyptic number.

It is an amenable number.

264781605 is a deficient number, since it is larger than the sum of its proper divisors (197382939).

264781605 is a wasteful number, since it uses less digits than its factorization.

264781605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604756.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 264781605 is about 16272.1112643689. Note that the first 3 decimals coincide. The cubic root of 264781605 is about 642.1393293353.

The spelling of 264781605 in words is "two hundred sixty-four million, seven hundred eighty-one thousand, six hundred five".