19791017928 has 64 divisors (see below), whose sum is σ = 59972788800. Its totient is φ = 5997277440.

The previous prime is 19791017921. The next prime is 19791017941. The reversal of 19791017928 is 82971019791.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19791017921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4162401 + ... + 4167152.

It is an arithmetic number, because the mean of its divisors is an integer number (937074825).

Almost surely, 2^19791017928 is an apocalyptic number.

19791017928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19791017928 is an abundant number, since it is smaller than the sum of its proper divisors (40181770872).

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

19791017928 is a wasteful number, since it uses less digits than its factorization.

19791017928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8329579 (or 8329569 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 54.

The spelling of 19791017928 in words is "nineteen billion, seven hundred ninety-one million, seventeen thousand, nine hundred twenty-eight".