18308028 has 12 divisors (see below), whose sum is σ = 42718760. Its totient is φ = 6102672.

The previous prime is 18307999. The next prime is 18308029. The reversal of 18308028 is 82080381.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 18307986 and 18308004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18308029) 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, 762823 + ... + 762846.

Almost surely, 2^18308028 is an apocalyptic number.

It is an amenable number.

18308028 is an abundant number, since it is smaller than the sum of its proper divisors (24410732).

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

18308028 is a wasteful number, since it uses less digits than its factorization.

18308028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525676 (or 1525674 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18308028 is about 4278.7881461928. The cubic root of 18308028 is about 263.5606212998.

The spelling of 18308028 in words is "eighteen million, three hundred eight thousand, twenty-eight".