18473728 has 108 divisors (see below), whose sum is σ = 46382448. Its totient is φ = 7188480.

The previous prime is 18473717. The next prime is 18473743. The reversal of 18473728 is 82737481.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302818 + ... + 302878.

Almost surely, 2^18473728 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 18473728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23191224).

18473728 is an abundant number, since it is smaller than the sum of its proper divisors (27908720).

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

18473728 is an equidigital number, since it uses as much as digits as its factorization.

18473728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 83 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 18473728 is about 4298.1074905125. The cubic root of 18473728 is about 264.3533682446.

The spelling of 18473728 in words is "eighteen million, four hundred seventy-three thousand, seven hundred twenty-eight".