818072865 has 56 divisors (see below), whose sum is σ = 1486829760. Its totient is φ = 431871264.

The previous prime is 818072791. The next prime is 818072867. The reversal of 818072865 is 568270818.

It is not a de Polignac number, because 818072865 - 2⁷ = 818072737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 818072865.

It is not an unprimeable number, because it can be changed into a prime (818072867) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 374346 + ... + 376524.

Almost surely, 2^818072865 is an apocalyptic number.

It is an amenable number.

818072865 is a deficient number, since it is larger than the sum of its proper divisors (668756895).

818072865 is a wasteful number, since it uses less digits than its factorization.

818072865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305 (or 2290 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The square root of 818072865 is about 28601.9730962743. The cubic root of 818072865 is about 935.2563434894.

The spelling of 818072865 in words is "eight hundred eighteen million, seventy-two thousand, eight hundred sixty-five".