19881888832 has 56 divisors (see below), whose sum is σ = 42523522776. Its totient is φ = 9168580608.

The previous prime is 19881888757. The next prime is 19881888889. The reversal of 19881888832 is 23888818891.

It can be written as a sum of positive squares in 4 ways, for example, as 3512221696 + 16369667136 = 59264^2 + 127944^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1053108 + ... + 1071820.

It is an arithmetic number, because the mean of its divisors is an integer number (759348621).

Almost surely, 2^19881888832 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 19881888832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21261761388).

19881888832 is an abundant number, since it is smaller than the sum of its proper divisors (22641633944).

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

19881888832 is a wasteful number, since it uses less digits than its factorization.

19881888832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20015 (or 20005 counting only the distinct ones).

The product of its digits is 14155776, while the sum is 64.

The spelling of 19881888832 in words is "nineteen billion, eight hundred eighty-one million, eight hundred eighty-eight thousand, eight hundred thirty-two".