19999890888 has 32 divisors (see below), whose sum is σ = 50005136160. Its totient is φ = 6665909120.

The previous prime is 19999890877. The next prime is 19999890893. The reversal of 19999890888 is 88809899991.

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, 211123 + ... + 290813.

It is an arithmetic number, because the mean of its divisors is an integer number (1562660505).

Almost surely, 2^19999890888 is an apocalyptic number.

It is an amenable number.

19999890888 is an abundant number, since it is smaller than the sum of its proper divisors (30005245272).

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

19999890888 is a wasteful number, since it uses less digits than its factorization.

19999890888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90157 (or 90153 counting only the distinct ones).

The product of its (nonzero) digits is 241864704, while the sum is 78.

The spelling of 19999890888 in words is "nineteen billion, nine hundred ninety-nine million, eight hundred ninety thousand, eight hundred eighty-eight".