18005648 has 20 divisors (see below), whose sum is σ = 35698608. Its totient is φ = 8793120.

The previous prime is 18005641. The next prime is 18005651. The reversal of 18005648 is 84650081.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18005641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12398 + ... + 13773.

Almost surely, 2^18005648 is an apocalyptic number.

It is an amenable number.

18005648 is a deficient number, since it is larger than the sum of its proper divisors (17692960).

18005648 is a wasteful number, since it uses less digits than its factorization.

18005648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26222 (or 26216 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 18005648 is about 4243.3062580964. The cubic root of 18005648 is about 262.1015475681.

The spelling of 18005648 in words is "eighteen million, five thousand, six hundred forty-eight".