18013328 has 10 divisors (see below), whose sum is σ = 34900854. Its totient is φ = 9006656.

The previous prime is 18013313. The next prime is 18013357. The reversal of 18013328 is 82331081.

It can be written as a sum of positive squares in only one way, i.e., 10549504 + 7463824 = 3248^2 + 2732^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18013297 and 18013306.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562901 + ... + 562932.

Almost surely, 2^18013328 is an apocalyptic number.

It is an amenable number.

18013328 is a deficient number, since it is larger than the sum of its proper divisors (16887526).

18013328 is a wasteful number, since it uses less digits than its factorization.

18013328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125841 (or 1125835 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18013328 is about 4244.2111163325. The cubic root of 18013328 is about 262.1388072427.

The spelling of 18013328 in words is "eighteen million, thirteen thousand, three hundred twenty-eight".