18108816 has 40 divisors (see below), whose sum is σ = 51035424. Its totient is φ = 5487360.

The previous prime is 18108793. The next prime is 18108823. The reversal of 18108816 is 61880181.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16621 + ... + 17676.

Almost surely, 2^18108816 is an apocalyptic number.

18108816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18108816 is an abundant number, since it is smaller than the sum of its proper divisors (32926608).

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

18108816 is a wasteful number, since it uses less digits than its factorization.

18108816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34319 (or 34313 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 33.

The square root of 18108816 is about 4255.4454525937. The cubic root of 18108816 is about 262.6011872936.

Adding to 18108816 its reverse (61880181), we get a palindrome (79988997).

The spelling of 18108816 in words is "eighteen million, one hundred eight thousand, eight hundred sixteen".