19728964809708 has 1152 divisors, whose sum is σ = 64696473354240. Its totient is φ = 4647273523200.

The previous prime is 19728964809661. The next prime is 19728964809731. The reversal of 19728964809708 is 80790846982791.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 58542922116 + ... + 58542922452.

It is an arithmetic number, because the mean of its divisors is an integer number (56160133120).

Almost surely, 2^{19728964809708} 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 19728964809708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32348236677120).

19728964809708 is an abundant number, since it is smaller than the sum of its proper divisors (44967508544532).

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

19728964809708 is a wasteful number, since it uses less digits than its factorization.

19728964809708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 877879296, while the sum is 78.

The spelling of 19728964809708 in words is "nineteen trillion, seven hundred twenty-eight billion, nine hundred sixty-four million, eight hundred nine thousand, seven hundred eight".