18028404 has 36 divisors (see below), whose sum is σ = 45891300. Its totient is φ = 5967360.

The previous prime is 18028379. The next prime is 18028411. The reversal of 18028404 is 40482081.

It can be written as a sum of positive squares in 2 ways, for example, as 7452900 + 10575504 = 2730^2 + 3252^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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, 3684 + ... + 7044.

Almost surely, 2^18028404 is an apocalyptic number.

It is an amenable number.

18028404 is an abundant number, since it is smaller than the sum of its proper divisors (27862896).

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

18028404 is a wasteful number, since it uses less digits than its factorization.

18028404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520 (or 3515 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 18028404 is about 4245.9868110959. The cubic root of 18028404 is about 262.2119179721.

The spelling of 18028404 in words is "eighteen million, twenty-eight thousand, four hundred four".