18808323840 has 324 divisors, whose sum is σ = 66698855496. Its totient is φ = 4893364224.

The previous prime is 18808323803. The next prime is 18808323851. The reversal of 18808323840 is 4832380881.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 35 ways as a sum of consecutive naturals, for example, 21300039 + ... + 21300921.

Almost surely, 2^18808323840 is an apocalyptic number.

18808323840 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 18808323840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33349427748).

18808323840 is an abundant number, since it is smaller than the sum of its proper divisors (47890531656).

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

18808323840 is an equidigital number, since it uses as much as digits as its factorization.

18808323840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996 (or 936 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The spelling of 18808323840 in words is "eighteen billion, eight hundred eight million, three hundred twenty-three thousand, eight hundred forty".