18720532800 has 504 divisors, whose sum is σ = 71415920160. Its totient is φ = 4636569600.

The previous prime is 18720532793. The next prime is 18720532811. The reversal of 18720532800 is 823502781.

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 71 ways as a sum of consecutive naturals, for example, 14500155 + ... + 14501445.

Almost surely, 2^18720532800 is an apocalyptic number.

18720532800 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 18720532800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35707960080).

18720532800 is an abundant number, since it is smaller than the sum of its proper divisors (52695387360).

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

18720532800 is a wasteful number, since it uses less digits than its factorization.

18720532800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391 (or 1373 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 18720532800 in words is "eighteen billion, seven hundred twenty million, five hundred thirty-two thousand, eight hundred".