19639607680 has 576 divisors, whose sum is σ = 63613764720. Its totient is φ = 5732106240.

The previous prime is 19639607567. The next prime is 19639607693. The reversal of 19639607680 is 8670693691.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 99693342 + ... + 99693538.

Almost surely, 2^19639607680 is an apocalyptic number.

19639607680 is a gapful number since it is divisible by the number (10) 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 19639607680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31806882360).

19639607680 is an abundant number, since it is smaller than the sum of its proper divisors (43974157040).

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

19639607680 is a wasteful number, since it uses less digits than its factorization.

19639607680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 19639607680 in words is "nineteen billion, six hundred thirty-nine million, six hundred seven thousand, six hundred eighty".