19990529736 has 128 divisors (see below), whose sum is σ = 54075772800. Its totient is φ = 6137579520.

The previous prime is 19990529731. The next prime is 19990529749. The reversal of 19990529736 is 63792509991.

It is a self number, because there is not a number n which added to its sum of digits gives 19990529736.

It is not an unprimeable number, because it can be changed into a prime (19990529731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5924946 + ... + 5928318.

It is an arithmetic number, because the mean of its divisors is an integer number (422466975).

Almost surely, 2^19990529736 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 19990529736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27037886400).

19990529736 is an abundant number, since it is smaller than the sum of its proper divisors (34085243064).

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

19990529736 is a wasteful number, since it uses less digits than its factorization.

19990529736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3759 (or 3755 counting only the distinct ones).

The product of its (nonzero) digits is 8266860, while the sum is 60.

The spelling of 19990529736 in words is "nineteen billion, nine hundred ninety million, five hundred twenty-nine thousand, seven hundred thirty-six".