18478880 has 72 divisors (see below), whose sum is σ = 50805468. Its totient is φ = 6332928.

The previous prime is 18478853. The next prime is 18478891. The reversal of 18478880 is 8887481.

It can be written as a sum of positive squares in 2 ways, for example, as 17405584 + 1073296 = 4172^2 + 1036^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6662 + ... + 9018.

Almost surely, 2^18478880 is an apocalyptic number.

18478880 is a gapful number since it is divisible by the number (10) 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 18478880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25402734).

18478880 is an abundant number, since it is smaller than the sum of its proper divisors (32326588).

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

18478880 is a wasteful number, since it uses less digits than its factorization.

18478880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386 (or 2371 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 44.

The square root of 18478880 is about 4298.7067822777. The cubic root of 18478880 is about 264.3779404726.

The spelling of 18478880 in words is "eighteen million, four hundred seventy-eight thousand, eight hundred eighty".