19889128447704 has 64 divisors (see below), whose sum is σ = 55509416016000. Its totient is φ = 6598289043360.

The previous prime is 19889128447679. The next prime is 19889128447717. The reversal of 19889128447704 is 40774482198891.

19889128447704 is a `hidden beast` number, since 1 + 9 + 8 + 8 + 91 + 28 + 447 + 70 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218151814 + ... + 218242965.

It is an arithmetic number, because the mean of its divisors is an integer number (867334625250).

Almost surely, 2^{19889128447704} is an apocalyptic number.

It is an amenable number.

19889128447704 is an abundant number, since it is smaller than the sum of its proper divisors (35620287568296).

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

19889128447704 is a wasteful number, since it uses less digits than its factorization.

19889128447704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436395005 (or 436394995 counting only the distinct ones).

The product of its (nonzero) digits is 260112384, while the sum is 72.

The spelling of 19889128447704 in words is "nineteen trillion, eight hundred eighty-nine billion, one hundred twenty-eight million, four hundred forty-seven thousand, seven hundred four".