18688448 has 28 divisors (see below), whose sum is σ = 37700712. Its totient is φ = 9189120.

The previous prime is 18688447. The next prime is 18688451. The reversal of 18688448 is 84488681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18688447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511 + ... + 6297.

It is an arithmetic number, because the mean of its divisors is an integer number (1346454).

Almost surely, 2^18688448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18688448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18850356).

18688448 is an abundant number, since it is smaller than the sum of its proper divisors (19012264).

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

18688448 is an equidigital number, since it uses as much as digits as its factorization.

18688448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860 (or 4850 counting only the distinct ones).

The product of its digits is 393216, while the sum is 47.

The square root of 18688448 is about 4323.0137635682. The cubic root of 18688448 is about 265.3736180063.

The spelling of 18688448 in words is "eighteen million, six hundred eighty-eight thousand, four hundred forty-eight".