18327680 has 64 divisors (see below), whose sum is σ = 50086080. Its totient is φ = 6282240.

The previous prime is 18327679. The next prime is 18327703. The reversal of 18327680 is 8672381.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 18327680.

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, 2435 + ... + 6525.

It is an arithmetic number, because the mean of its divisors is an integer number (782595).

Almost surely, 2^18327680 is an apocalyptic number.

18327680 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 18327680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25043040).

18327680 is an abundant number, since it is smaller than the sum of its proper divisors (31758400).

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

18327680 is an equidigital number, since it uses as much as digits as its factorization.

18327680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117 (or 4105 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18327680 is about 4281.0839748830. The cubic root of 18327680 is about 263.6548903494.

The spelling of 18327680 in words is "eighteen million, three hundred twenty-seven thousand, six hundred eighty".