18805728 has 24 divisors (see below), whose sum is σ = 49365288. Its totient is φ = 6268544.

The previous prime is 18805711. The next prime is 18805729. The reversal of 18805728 is 82750881.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18805729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97851 + ... + 98042.

It is an arithmetic number, because the mean of its divisors is an integer number (2056887).

Almost surely, 2^18805728 is an apocalyptic number.

It is an amenable number.

18805728 is an abundant number, since it is smaller than the sum of its proper divisors (30559560).

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

18805728 is a wasteful number, since it uses less digits than its factorization.

18805728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195906 (or 195898 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 18805728 is about 4336.5571597755. The cubic root of 18805728 is about 265.9275812430.

The spelling of 18805728 in words is "eighteen million, eight hundred five thousand, seven hundred twenty-eight".