18919093788 has 144 divisors (see below), whose sum is σ = 57002143744. Its totient is φ = 5176949760.

The previous prime is 18919093769. The next prime is 18919093793. The reversal of 18919093788 is 88739091981.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 745281 + ... + 770247.

Almost surely, 2^18919093788 is an apocalyptic number.

18919093788 is a gapful number since it is divisible by the number (18) 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 18919093788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28501071872).

18919093788 is an abundant number, since it is smaller than the sum of its proper divisors (38083049956).

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

18919093788 is a wasteful number, since it uses less digits than its factorization.

18919093788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25112 (or 25107 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 63.

The spelling of 18919093788 in words is "eighteen billion, nine hundred nineteen million, ninety-three thousand, seven hundred eighty-eight".