19728847836 has 192 divisors, whose sum is σ = 53275622400. Its totient is φ = 6310317312.

The previous prime is 19728847819. The next prime is 19728847841. The reversal of 19728847836 is 63874882791.

19728847836 is a `hidden beast` number, since 19 + 72 + 88 + 478 + 3 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64263195 + ... + 64263501.

It is an arithmetic number, because the mean of its divisors is an integer number (277477200).

Almost surely, 2^19728847836 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 19728847836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26637811200).

19728847836 is an abundant number, since it is smaller than the sum of its proper divisors (33546774564).

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

19728847836 is a wasteful number, since it uses less digits than its factorization.

19728847836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585 (or 577 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 19728847836 in words is "nineteen billion, seven hundred twenty-eight million, eight hundred forty-seven thousand, eight hundred thirty-six".