18681648 has 40 divisors (see below), whose sum is σ = 48645696. Its totient is φ = 6177600.

The previous prime is 18681647. The next prime is 18681653. The reversal of 18681648 is 84618681.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18681643) 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 7 ways as a sum of consecutive naturals, for example, 4803 + ... + 7773.

Almost surely, 2^18681648 is an apocalyptic number.

It is an amenable number.

18681648 is an abundant number, since it is smaller than the sum of its proper divisors (29964048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18681648 is a wasteful number, since it uses less digits than its factorization.

18681648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113 (or 3107 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 18681648 is about 4322.2272036532. The cubic root of 18681648 is about 265.3414277193.

The spelling of 18681648 in words is "eighteen million, six hundred eighty-one thousand, six hundred forty-eight".