80856618 has 48 divisors (see below), whose sum is σ = 172067040. Its totient is φ = 25310880.

The previous prime is 80856613. The next prime is 80856619. The reversal of 80856618 is 81665808.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 80856618.

It is not an unprimeable number, because it can be changed into a prime (80856613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213153 + ... + 213531.

It is an arithmetic number, because the mean of its divisors is an integer number (3584730).

Almost surely, 2^80856618 is an apocalyptic number.

80856618 is an abundant number, since it is smaller than the sum of its proper divisors (91210422).

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

80856618 is a wasteful number, since it uses less digits than its factorization.

80856618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 80856618 is about 8992.0308051074. The cubic root of 80856618 is about 432.4194207640.

The spelling of 80856618 in words is "eighty million, eight hundred fifty-six thousand, six hundred eighteen".