19984715128 has 32 divisors (see below), whose sum is σ = 45078307200. Its totient is φ = 8114094432.

The previous prime is 19984715081. The next prime is 19984715137. The reversal of 19984715128 is 82151748991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9390250 + ... + 9392377.

It is an arithmetic number, because the mean of its divisors is an integer number (1408697100).

Almost surely, 2^19984715128 is an apocalyptic number.

It is an amenable number.

19984715128 is an abundant number, since it is smaller than the sum of its proper divisors (25093592072).

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

19984715128 is a wasteful number, since it uses less digits than its factorization.

19984715128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18782659 (or 18782655 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 55.

The spelling of 19984715128 in words is "nineteen billion, nine hundred eighty-four million, seven hundred fifteen thousand, one hundred twenty-eight".