19799764840 has 32 divisors (see below), whose sum is σ = 44553991680. Its totient is φ = 7919102272.

The previous prime is 19799764807. The next prime is 19799764841. The reversal of 19799764840 is 4846799791.

It is not an unprimeable number, because it can be changed into a prime (19799764841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520137 + ... + 556903.

It is an arithmetic number, because the mean of its divisors is an integer number (1392312240).

Almost surely, 2^19799764840 is an apocalyptic number.

19799764840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19799764840 is an abundant number, since it is smaller than the sum of its proper divisors (24754226840).

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

19799764840 is a wasteful number, since it uses less digits than its factorization.

19799764840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50241 (or 50237 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 64.

The spelling of 19799764840 in words is "nineteen billion, seven hundred ninety-nine million, seven hundred sixty-four thousand, eight hundred forty".