19988072856 has 96 divisors (see below), whose sum is σ = 54471268800. Its totient is φ = 6621350400.

The previous prime is 19988072849. The next prime is 19988072857. The reversal of 19988072856 is 65827088991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19988072793 and 19988072802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19988072857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12061980 + ... + 12063636.

It is an arithmetic number, because the mean of its divisors is an integer number (567409050).

Almost surely, 2^19988072856 is an apocalyptic number.

It is an amenable number.

19988072856 is an abundant number, since it is smaller than the sum of its proper divisors (34483195944).

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

19988072856 is a wasteful number, since it uses less digits than its factorization.

19988072856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609 (or 2602 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 63.

The spelling of 19988072856 in words is "nineteen billion, nine hundred eighty-eight million, seventy-two thousand, eight hundred fifty-six".