18312728 has 32 divisors (see below), whose sum is σ = 39396000. Its totient is φ = 7817472.

The previous prime is 18312683. The next prime is 18312731. The reversal of 18312728 is 82721381.

It is a junction number, because it is equal to n+sod(n) for n = 18312694 and 18312703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19076 + ... + 20012.

It is an arithmetic number, because the mean of its divisors is an integer number (1231125).

Almost surely, 2^18312728 is an apocalyptic number.

It is an amenable number.

18312728 is an abundant number, since it is smaller than the sum of its proper divisors (21083272).

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

18312728 is a wasteful number, since it uses less digits than its factorization.

18312728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299 (or 1295 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 18312728 is about 4279.3373318774. The cubic root of 18312728 is about 263.5831729537.

The spelling of 18312728 in words is "eighteen million, three hundred twelve thousand, seven hundred twenty-eight".