18439680624 has 80 divisors (see below), whose sum is σ = 49315072800. Its totient is φ = 5930201088.

The previous prime is 18439680569. The next prime is 18439680629. The reversal of 18439680624 is 42608693481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18439680629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2235612 + ... + 2243844.

It is an arithmetic number, because the mean of its divisors is an integer number (616438410).

Almost surely, 2^18439680624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18439680624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24657536400).

18439680624 is an abundant number, since it is smaller than the sum of its proper divisors (30875392176).

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

18439680624 is a wasteful number, since it uses less digits than its factorization.

18439680624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9882 (or 9876 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 18439680624 in words is "eighteen billion, four hundred thirty-nine million, six hundred eighty thousand, six hundred twenty-four".