19728780744 has 32 divisors (see below), whose sum is σ = 49342792320. Its totient is φ = 6573481536.

The previous prime is 19728780713. The next prime is 19728780751. The reversal of 19728780744 is 44708782791.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 115287 + ... + 229670.

It is an arithmetic number, because the mean of its divisors is an integer number (1541962260).

Almost surely, 2^19728780744 is an apocalyptic number.

It is an amenable number.

19728780744 is an abundant number, since it is smaller than the sum of its proper divisors (29614011576).

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

19728780744 is a wasteful number, since it uses less digits than its factorization.

19728780744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347349 (or 347345 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 57.

The spelling of 19728780744 in words is "nineteen billion, seven hundred twenty-eight million, seven hundred eighty thousand, seven hundred forty-four".