18328978000 has 40 divisors (see below), whose sum is σ = 44319473640. Its totient is φ = 7331590400.

The previous prime is 18328977917. The next prime is 18328978013. The reversal of 18328978000 is 87982381.

It can be written as a sum of positive squares in 4 ways, for example, as 150544 + 18328827456 = 388^2 + 135384^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4580245 + ... + 4584244.

It is an arithmetic number, because the mean of its divisors is an integer number (1107986841).

Almost surely, 2^18328978000 is an apocalyptic number.

18328978000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18328978000 is an abundant number, since it is smaller than the sum of its proper divisors (25990495640).

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

18328978000 is an equidigital number, since it uses as much as digits as its factorization.

18328978000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9164512 (or 9164496 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 18328978000 in words is "eighteen billion, three hundred twenty-eight million, nine hundred seventy-eight thousand".