18108688 has 60 divisors (see below), whose sum is σ = 39234468. Its totient is φ = 8087040.

The previous prime is 18108667. The next prime is 18108697. The reversal of 18108688 is 88680181.

It can be written as a sum of positive squares in 6 ways, for example, as 4210704 + 13897984 = 2052^2 + 3728^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18108688.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99958 + ... + 100138.

Almost surely, 2^18108688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18108688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19617234).

18108688 is an abundant number, since it is smaller than the sum of its proper divisors (21125780).

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

18108688 is a wasteful number, since it uses less digits than its factorization.

18108688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 18108688 is about 4255.4304130135. The cubic root of 18108688 is about 262.6005685705.

The spelling of 18108688 in words is "eighteen million, one hundred eight thousand, six hundred eighty-eight".