18719293888 has 56 divisors (see below), whose sum is σ = 38088344448. Its totient is φ = 9123131136.

The previous prime is 18719293883. The next prime is 18719293891. The reversal of 18719293888 is 88839291781.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18719293883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1377495 + ... + 1391017.

It is an arithmetic number, because the mean of its divisors is an integer number (680149008).

Almost surely, 2^18719293888 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 18719293888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19044172224).

18719293888 is an abundant number, since it is smaller than the sum of its proper divisors (19369050560).

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

18719293888 is a wasteful number, since it uses less digits than its factorization.

18719293888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14081 (or 14071 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 64.

The spelling of 18719293888 in words is "eighteen billion, seven hundred nineteen million, two hundred ninety-three thousand, eight hundred eighty-eight".