18743780864 has 80 divisors (see below), whose sum is σ = 38564251968. Its totient is φ = 9094643712.

The previous prime is 18743780837. The next prime is 18743780893. The reversal of 18743780864 is 46808734781.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8770004 + ... + 8772140.

Almost surely, 2^18743780864 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 18743780864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19282125984).

18743780864 is an abundant number, since it is smaller than the sum of its proper divisors (19820471104).

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

18743780864 is an equidigital number, since it uses as much as digits as its factorization.

18743780864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655 (or 2639 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 56.

The spelling of 18743780864 in words is "eighteen billion, seven hundred forty-three million, seven hundred eighty thousand, eight hundred sixty-four".