18877820832 has 144 divisors (see below), whose sum is σ = 57865003560. Its totient is φ = 5803370496.

The previous prime is 18877820809. The next prime is 18877820849. The reversal of 18877820832 is 23802877881.

It can be written as a sum of positive squares in 4 ways, for example, as 14437464336 + 4440356496 = 120156^2 + 66636^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7745118 + ... + 7747554.

Almost surely, 2^18877820832 is an apocalyptic number.

18877820832 is a gapful number since it is divisible by the number (12) 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 18877820832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28932501780).

18877820832 is an abundant number, since it is smaller than the sum of its proper divisors (38987182728).

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

18877820832 is a wasteful number, since it uses less digits than its factorization.

18877820832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535 (or 4524 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 54.

The spelling of 18877820832 in words is "eighteen billion, eight hundred seventy-seven million, eight hundred twenty thousand, eight hundred thirty-two".