18944889600 has 648 divisors, whose sum is σ = 78374931600. Its totient is φ = 3994583040.

The previous prime is 18944889599. The next prime is 18944889731. The reversal of 18944889600 is 698844981.

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 71 ways as a sum of consecutive naturals, for example, 12229626 + ... + 12231174.

Almost surely, 2^18944889600 is an apocalyptic number.

18944889600 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 18944889600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39187465800).

18944889600 is an abundant number, since it is smaller than the sum of its proper divisors (59430042000).

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

18944889600 is a wasteful number, since it uses less digits than its factorization.

18944889600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605 (or 1579 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 57.

The spelling of 18944889600 in words is "eighteen billion, nine hundred forty-four million, eight hundred eighty-nine thousand, six hundred".