18326880 has 288 divisors, whose sum is σ = 74299680. Its totient is φ = 4055040.

The previous prime is 18326873. The next prime is 18326899. The reversal of 18326880 is 8862381.

It is a tau number, because it is divible by the number of its divisors (288).

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 205876 + ... + 205964.

It is an arithmetic number, because the mean of its divisors is an integer number (257985).

Almost surely, 2^18326880 is an apocalyptic number.

18326880 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 18326880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37149840).

18326880 is an abundant number, since it is smaller than the sum of its proper divisors (55972800).

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

18326880 is a wasteful number, since it uses less digits than its factorization.

18326880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18326880 is about 4280.9905395831. The cubic root of 18326880 is about 263.6510541304.

The spelling of 18326880 in words is "eighteen million, three hundred twenty-six thousand, eight hundred eighty".