19428196638 has 16 divisors (see below), whose sum is σ = 38996672400. Its totient is φ = 6452685696.

The previous prime is 19428196603. The next prime is 19428196663. The reversal of 19428196638 is 83669182491.

It is a congruent number.

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, 5843163 + ... + 5846486.

It is an arithmetic number, because the mean of its divisors is an integer number (2437292025).

Almost surely, 2^19428196638 is an apocalyptic number.

19428196638 is an abundant number, since it is smaller than the sum of its proper divisors (19568475762).

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

19428196638 is a wasteful number, since it uses less digits than its factorization.

19428196638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689931.

The product of its digits is 4478976, while the sum is 57.

The spelling of 19428196638 in words is "nineteen billion, four hundred twenty-eight million, one hundred ninety-six thousand, six hundred thirty-eight".