18516728 has 8 divisors (see below), whose sum is σ = 34718880. Its totient is φ = 9258360.

The previous prime is 18516713. The next prime is 18516739. The reversal of 18516728 is 82761581.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 18516691 and 18516700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1157288 + ... + 1157303.

It is an arithmetic number, because the mean of its divisors is an integer number (4339860).

Almost surely, 2^18516728 is an apocalyptic number.

It is an amenable number.

18516728 is a deficient number, since it is larger than the sum of its proper divisors (16202152).

18516728 is a wasteful number, since it uses less digits than its factorization.

18516728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314597 (or 2314593 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 18516728 is about 4303.1067846383. The cubic root of 18516728 is about 264.5583149069.

The spelling of 18516728 in words is "eighteen million, five hundred sixteen thousand, seven hundred twenty-eight".