19998093888 has 280 divisors, whose sum is σ = 64474645752. Its totient is φ = 6103351296.

The previous prime is 19998093839. The next prime is 19998093919. The reversal of 19998093888 is 88839089991.

It can be written as a sum of positive squares in 4 ways, for example, as 15407760384 + 4590333504 = 124128^2 + 67752^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3257670 + ... + 3263802.

Almost surely, 2^19998093888 is an apocalyptic number.

19998093888 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 19998093888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32237322876).

19998093888 is an abundant number, since it is smaller than the sum of its proper divisors (44476551864).

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

19998093888 is a wasteful number, since it uses less digits than its factorization.

19998093888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6211 (or 6192 counting only the distinct ones).

The product of its (nonzero) digits is 80621568, while the sum is 72.

The spelling of 19998093888 in words is "nineteen billion, nine hundred ninety-eight million, ninety-three thousand, eight hundred eighty-eight".