18007328 has 24 divisors (see below), whose sum is σ = 35659260. Its totient is φ = 8951040.

The previous prime is 18007303. The next prime is 18007343. The reversal of 18007328 is 82370081.

It can be written as a sum of positive squares in 2 ways, for example, as 13630864 + 4376464 = 3692^2 + 2092^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18007328.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4238 + ... + 7346.

Almost surely, 2^18007328 is an apocalyptic number.

It is an amenable number.

18007328 is a deficient number, since it is larger than the sum of its proper divisors (17651932).

18007328 is a wasteful number, since it uses less digits than its factorization.

18007328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300 (or 3292 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18007328 is about 4243.5042123226. The cubic root of 18007328 is about 262.1096990271.

The spelling of 18007328 in words is "eighteen million, seven thousand, three hundred twenty-eight".