19678640000 has 80 divisors (see below), whose sum is σ = 48988943520. Its totient is φ = 7871424000.

The previous prime is 19678639993. The next prime is 19678640053. The reversal of 19678640000 is 4687691.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 19678640000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 42992 + ... + 202991.

It is an arithmetic number, because the mean of its divisors is an integer number (612361794).

Almost surely, 2^19678640000 is an apocalyptic number.

19678640000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19678640000 is an abundant number, since it is smaller than the sum of its proper divisors (29310303520).

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

19678640000 is an frugal number, since it uses more digits than its factorization.

19678640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246017 (or 245990 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 19678640000 in words is "nineteen billion, six hundred seventy-eight million, six hundred forty thousand".