18000028 has 6 divisors (see below), whose sum is σ = 31500056. Its totient is φ = 9000012.

The previous prime is 17999987. The next prime is 18000041. The reversal of 18000028 is 82000081.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 17999969 and 18000014.

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, 2250000 + ... + 2250007.

Almost surely, 2^18000028 is an apocalyptic number.

It is an amenable number.

18000028 is a deficient number, since it is larger than the sum of its proper divisors (13500028).

18000028 is a wasteful number, since it uses less digits than its factorization.

18000028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500011 (or 4500009 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 18000028 is about 4242.6439869496. The cubic root of 18000028 is about 262.0742753111.

The spelling of 18000028 in words is "eighteen million, twenty-eight", and thus it is an aban number and an uban number.