264665620 has 12 divisors (see below), whose sum is σ = 555797844. Its totient is φ = 105866240.

The previous prime is 264665617. The next prime is 264665627. The reversal of 264665620 is 26566462.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 189392644 + 75272976 = 13762^2 + 8676^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 264665620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264665627) 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, 6616621 + ... + 6616660.

It is an arithmetic number, because the mean of its divisors is an integer number (46316487).

Almost surely, 2^264665620 is an apocalyptic number.

264665620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

264665620 is an abundant number, since it is smaller than the sum of its proper divisors (291132224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

264665620 is a wasteful number, since it uses less digits than its factorization.

264665620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13233290 (or 13233288 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 264665620 is about 16268.5469541690. The cubic root of 264665620 is about 642.0455546846.

The spelling of 264665620 in words is "two hundred sixty-four million, six hundred sixty-five thousand, six hundred twenty".