19643034744 has 96 divisors (see below), whose sum is σ = 56388150000. Its totient is φ = 6156082176.

The previous prime is 19643034739. The next prime is 19643034757. The reversal of 19643034744 is 44743034691.

It is a super-2 number, since 2×19643034744² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19643034744.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1239382 + ... + 1255130.

Almost surely, 2^19643034744 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 19643034744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28194075000).

19643034744 is an abundant number, since it is smaller than the sum of its proper divisors (36745115256).

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

19643034744 is a wasteful number, since it uses less digits than its factorization.

19643034744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16797 (or 16790 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 45.

The spelling of 19643034744 in words is "nineteen billion, six hundred forty-three million, thirty-four thousand, seven hundred forty-four".