815565252 has 24 divisors (see below), whose sum is σ = 1904933632. Its totient is φ = 271576800.

The previous prime is 815565251. The next prime is 815565277. The reversal of 815565252 is 252565518.

It is a self number, because there is not a number n which added to its sum of digits gives 815565252.

It is not an unprimeable number, because it can be changed into a prime (815565251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22399 + ... + 46182.

Almost surely, 2^815565252 is an apocalyptic number.

It is an amenable number.

815565252 is an abundant number, since it is smaller than the sum of its proper divisors (1089368380).

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

815565252 is a wasteful number, since it uses less digits than its factorization.

815565252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69579 (or 69577 counting only the distinct ones).

The product of its digits is 120000, while the sum is 39.

The square root of 815565252 is about 28558.1030882655. The cubic root of 815565252 is about 934.2997614865.

The spelling of 815565252 in words is "eight hundred fifteen million, five hundred sixty-five thousand, two hundred fifty-two".