18630656 has 48 divisors (see below), whose sum is σ = 40687920. Its totient is φ = 8458240.

The previous prime is 18630631. The next prime is 18630679. The reversal of 18630656 is 65603681.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22115 + ... + 22941.

It is an arithmetic number, because the mean of its divisors is an integer number (847665).

Almost surely, 2^18630656 is an apocalyptic number.

18630656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18630656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20343960).

18630656 is an abundant number, since it is smaller than the sum of its proper divisors (22057264).

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

18630656 is an equidigital number, since it uses as much as digits as its factorization.

18630656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 18630656 is about 4316.3243622323. The cubic root of 18630656 is about 265.0997891657.

The spelling of 18630656 in words is "eighteen million, six hundred thirty thousand, six hundred fifty-six".