18128672 has 12 divisors (see below), whose sum is σ = 35690886. Its totient is φ = 9064320.

The previous prime is 18128609. The next prime is 18128687. The reversal of 18128672 is 27682181.

It can be written as a sum of positive squares in only one way, i.e., 16679056 + 1449616 = 4084^2 + 1204^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283229 + ... + 283292.

Almost surely, 2^18128672 is an apocalyptic number.

It is an amenable number.

18128672 is a deficient number, since it is larger than the sum of its proper divisors (17562214).

18128672 is an equidigital number, since it uses as much as digits as its factorization.

18128672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566531 (or 566523 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 18128672 is about 4257.7778241707. Note that the first 3 decimals coincide. The cubic root of 18128672 is about 262.6971314380.

The spelling of 18128672 in words is "eighteen million, one hundred twenty-eight thousand, six hundred seventy-two".