189978519808 has 144 divisors (see below), whose sum is σ = 480803742720. Its totient is φ = 72762624000.

The previous prime is 189978519803. The next prime is 189978519811. The reversal of 189978519808 is 808915879981.

It is not an unprimeable number, because it can be changed into a prime (189978519803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1081333 + ... + 1244683.

It is an arithmetic number, because the mean of its divisors is an integer number (3338914880).

Almost surely, 2^189978519808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189978519808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240401871360).

189978519808 is an abundant number, since it is smaller than the sum of its proper divisors (290825222912).

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

189978519808 is a wasteful number, since it uses less digits than its factorization.

189978519808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163444 (or 163430 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 73.

The spelling of 189978519808 in words is "one hundred eighty-nine billion, nine hundred seventy-eight million, five hundred nineteen thousand, eight hundred eight".