19287121028 has 12 divisors (see below), whose sum is σ = 38574242112. Its totient is φ = 8265909000.

The previous prime is 19287120997. The next prime is 19287121033. The reversal of 19287121028 is 82012178291.

19287121028 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344412848 + ... + 344412903.

It is an arithmetic number, because the mean of its divisors is an integer number (3214520176).

Almost surely, 2^19287121028 is an apocalyptic number.

It is an amenable number.

19287121028 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19287121028 is a wasteful number, since it uses less digits than its factorization.

19287121028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688825762 (or 688825760 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 41.

The spelling of 19287121028 in words is "nineteen billion, two hundred eighty-seven million, one hundred twenty-one thousand, twenty-eight".