19381100728 has 32 divisors (see below), whose sum is σ = 39680645760. Its totient is φ = 8801261280.

The previous prime is 19381100659. The next prime is 19381100737. The reversal of 19381100728 is 82700118391.

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, 10050 + ... + 197137.

It is an arithmetic number, because the mean of its divisors is an integer number (1240020180).

Almost surely, 2^19381100728 is an apocalyptic number.

It is an amenable number.

19381100728 is an abundant number, since it is smaller than the sum of its proper divisors (20299545032).

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

19381100728 is a wasteful number, since it uses less digits than its factorization.

19381100728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208267 (or 208263 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The spelling of 19381100728 in words is "nineteen billion, three hundred eighty-one million, one hundred thousand, seven hundred twenty-eight".