18266880 has 144 divisors (see below), whose sum is σ = 60044544. Its totient is φ = 4730880.

The previous prime is 18266869. The next prime is 18266881. The reversal of 18266880 is 8866281.

It is not an unprimeable number, because it can be changed into a prime (18266881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257245 + ... + 257315.

It is an arithmetic number, because the mean of its divisors is an integer number (416976).

Almost surely, 2^18266880 is an apocalyptic number.

18266880 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 18266880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30022272).

18266880 is an abundant number, since it is smaller than the sum of its proper divisors (41777664).

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

18266880 is an equidigital number, since it uses as much as digits as its factorization.

18266880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 18266880 is about 4273.9770705983. The cubic root of 18266880 is about 263.3630189611.

The spelling of 18266880 in words is "eighteen million, two hundred sixty-six thousand, eight hundred eighty".