19594800640 has 160 divisors (see below), whose sum is σ = 48087056160. Its totient is φ = 7655424000.

The previous prime is 19594800581. The next prime is 19594800683. The reversal of 19594800640 is 4600849591.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27952290 + ... + 27952990.

It is an arithmetic number, because the mean of its divisors is an integer number (300544101).

Almost surely, 2^19594800640 is an apocalyptic number.

19594800640 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 19594800640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24043528080).

19594800640 is an abundant number, since it is smaller than the sum of its proper divisors (28492255520).

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

19594800640 is an equidigital number, since it uses as much as digits as its factorization.

19594800640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 948 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 19594800640 in words is "nineteen billion, five hundred ninety-four million, eight hundred thousand, six hundred forty".