18128512 has 16 divisors (see below), whose sum is σ = 36115650. Its totient is φ = 9064192.

The previous prime is 18128503. The next prime is 18128533. The reversal of 18128512 is 21582181.

It can be written as a sum of positive squares in only one way, i.e., 11451456 + 6677056 = 3384^2 + 2584^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70687 + ... + 70942.

Almost surely, 2^18128512 is an apocalyptic number.

It is an amenable number.

18128512 is a deficient number, since it is larger than the sum of its proper divisors (17987138).

18128512 is an equidigital number, since it uses as much as digits as its factorization.

18128512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141643 (or 141631 counting only the distinct ones).

The product of its digits is 1280, while the sum is 28.

The square root of 18128512 is about 4257.7590349854. The cubic root of 18128512 is about 262.6963585985.

The spelling of 18128512 in words is "eighteen million, one hundred twenty-eight thousand, five hundred twelve".