19728082791 has 32 divisors (see below), whose sum is σ = 30361443840. Its totient is φ = 12650500800.

The previous prime is 19728082783. The next prime is 19728082807.

19728082791 is a `hidden beast` number, since 1 + 97 + 280 + 8 + 279 + 1 = 666.

19728082791 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 19728082791 - 2³ = 19728082783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728082711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46905 + ... + 204098.

It is an arithmetic number, because the mean of its divisors is an integer number (948795120).

Almost surely, 2^19728082791 is an apocalyptic number.

19728082791 is a deficient number, since it is larger than the sum of its proper divisors (10633361049).

19728082791 is a wasteful number, since it uses less digits than its factorization.

19728082791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251124 (or 251118 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The spelling of 19728082791 in words is "nineteen billion, seven hundred twenty-eight million, eighty-two thousand, seven hundred ninety-one".