18722880 has 224 divisors, whose sum is σ = 72420480. Its totient is φ = 4515840.

The previous prime is 18722867. The next prime is 18722903. The reversal of 18722880 is 8822781.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94942 + ... + 95138.

Almost surely, 2^18722880 is an apocalyptic number.

18722880 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 18722880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36210240).

18722880 is an abundant number, since it is smaller than the sum of its proper divisors (53697600).

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

18722880 is a wasteful number, since it uses less digits than its factorization.

18722880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 18722880 is about 4326.9943378747. The cubic root of 18722880 is about 265.5364947120.

Subtracting from 18722880 its reverse (8822781), we obtain a palindrome (9900099).

The spelling of 18722880 in words is "eighteen million, seven hundred twenty-two thousand, eight hundred eighty".