18799994640 has 640 divisors, whose sum is σ = 71995392000. Its totient is φ = 4050708480.

The previous prime is 18799994639. The next prime is 18799994659. The reversal of 18799994640 is 4649999781.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 135251691 + ... + 135251829.

It is an arithmetic number, because the mean of its divisors is an integer number (112492800).

Almost surely, 2^18799994640 is an apocalyptic number.

18799994640 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 18799994640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35997696000).

18799994640 is an abundant number, since it is smaller than the sum of its proper divisors (53195397360).

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

18799994640 is a wasteful number, since it uses less digits than its factorization.

18799994640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 66.

The spelling of 18799994640 in words is "eighteen billion, seven hundred ninety-nine million, nine hundred ninety-four thousand, six hundred forty".