18563648 has 14 divisors (see below), whose sum is σ = 36837366. Its totient is φ = 9281792.

The previous prime is 18563641. The next prime is 18563651. The reversal of 18563648 is 84636581.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 1982464 = 4072^2 + 1408^2 .

It is a super-3 number, since 3×18563648³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18563641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144965 + ... + 145092.

Almost surely, 2^18563648 is an apocalyptic number.

It is an amenable number.

18563648 is a deficient number, since it is larger than the sum of its proper divisors (18273718).

18563648 is an equidigital number, since it uses as much as digits as its factorization.

18563648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290069 (or 290059 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 18563648 is about 4308.5552102764. Note that the first 3 decimals coincide. The cubic root of 18563648 is about 264.7815834072.

The spelling of 18563648 in words is "eighteen million, five hundred sixty-three thousand, six hundred forty-eight".