18978608880 has 640 divisors, whose sum is σ = 83077539840. Its totient is φ = 3867402240.

The previous prime is 18978608849. The next prime is 18978608923. The reversal of 18978608880 is 8880687981.

It is a happy number.

18978608880 is a `hidden beast` number, since 18 + 9 + 7 + 8 + 608 + 8 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8813884 + ... + 8816036.

It is an arithmetic number, because the mean of its divisors is an integer number (129808656).

Almost surely, 2^18978608880 is an apocalyptic number.

18978608880 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 18978608880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41538769920).

18978608880 is an abundant number, since it is smaller than the sum of its proper divisors (64098930960).

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

18978608880 is a wasteful number, since it uses less digits than its factorization.

18978608880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246 (or 2234 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 63.

The spelling of 18978608880 in words is "eighteen billion, nine hundred seventy-eight million, six hundred eight thousand, eight hundred eighty".