18072778800 has 60 divisors (see below), whose sum is σ = 57893138600. Its totient is φ = 4819407360.

The previous prime is 18072778799. The next prime is 18072778807. The reversal of 18072778800 is 887727081.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18072778800.

It is not an unprimeable number, because it can be changed into a prime (18072778807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7529125 + ... + 7531524.

Almost surely, 2^18072778800 is an apocalyptic number.

18072778800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18072778800 is an abundant number, since it is smaller than the sum of its proper divisors (39820359800).

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

18072778800 is a wasteful number, since it uses less digits than its factorization.

18072778800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15060670 (or 15060659 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 48.

The spelling of 18072778800 in words is "eighteen billion, seventy-two million, seven hundred seventy-eight thousand, eight hundred".