19746738928 has 120 divisors (see below), whose sum is σ = 46172134080. Its totient is φ = 8147704320.

The previous prime is 19746738923. The next prime is 19746739031. The reversal of 19746738928 is 82983764791.

It is a self number, because there is not a number n which added to its sum of digits gives 19746738928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19746738923) 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 23 ways as a sum of consecutive naturals, for example, 9570825 + ... + 9572887.

It is an arithmetic number, because the mean of its divisors is an integer number (384767784).

Almost surely, 2^19746738928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19746738928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23086067040).

19746738928 is an abundant number, since it is smaller than the sum of its proper divisors (26425395152).

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

19746738928 is a wasteful number, since it uses less digits than its factorization.

19746738928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535 (or 2522 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 64.

The spelling of 19746738928 in words is "nineteen billion, seven hundred forty-six million, seven hundred thirty-eight thousand, nine hundred twenty-eight".