19638763632 has 100 divisors (see below), whose sum is σ = 57138592896. Its totient is φ = 6511898880.

The previous prime is 19638763589. The next prime is 19638763691. The reversal of 19638763632 is 23636783691.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 207868 + ... + 287204.

Almost surely, 2^19638763632 is an apocalyptic number.

19638763632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19638763632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28569296448).

19638763632 is an abundant number, since it is smaller than the sum of its proper divisors (37499829264).

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

19638763632 is a wasteful number, since it uses less digits than its factorization.

19638763632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79548 (or 79533 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The spelling of 19638763632 in words is "nineteen billion, six hundred thirty-eight million, seven hundred sixty-three thousand, six hundred thirty-two".