19243864239688 has 96 divisors (see below), whose sum is σ = 39807383880600. Its totient is φ = 8714877050880.

The previous prime is 19243864239679. The next prime is 19243864239689. The reversal of 19243864239688 is 88693246834291.

It can be written as a sum of positive squares in 4 ways, for example, as 7214606744004 + 12029257495684 = 2686002^2 + 3468322^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19243864239688.

It is not an unprimeable number, because it can be changed into a prime (19243864239689) 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, 645038020 + ... + 645067852.

Almost surely, 2^{19243864239688} 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 19243864239688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19903691940300).

19243864239688 is an abundant number, since it is smaller than the sum of its proper divisors (20563519640912).

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

19243864239688 is a wasteful number, since it uses less digits than its factorization.

19243864239688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32303 (or 32288 counting only the distinct ones).

The product of its digits is 859963392, while the sum is 73.

The spelling of 19243864239688 in words is "nineteen trillion, two hundred forty-three billion, eight hundred sixty-four million, two hundred thirty-nine thousand, six hundred eighty-eight".