18506728 has 16 divisors (see below), whose sum is σ = 34745760. Its totient is φ = 9241200.

The previous prime is 18506723. The next prime is 18506737. The reversal of 18506728 is 82760581.

It is not an unprimeable number, because it can be changed into a prime (18506723) 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, 11323 + ... + 12853.

It is an arithmetic number, because the mean of its divisors is an integer number (2171610).

Almost surely, 2^18506728 is an apocalyptic number.

It is an amenable number.

18506728 is a deficient number, since it is larger than the sum of its proper divisors (16239032).

18506728 is a wasteful number, since it uses less digits than its factorization.

18506728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3048 (or 3044 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 18506728 is about 4301.9446765387. The cubic root of 18506728 is about 264.5106812296.

The spelling of 18506728 in words is "eighteen million, five hundred six thousand, seven hundred twenty-eight".