198920087064 has 80 divisors (see below), whose sum is σ = 589934604600. Its totient is φ = 62406298368.

The previous prime is 198920087039. The next prime is 198920087077. The reversal of 198920087064 is 460780029891.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 198920087064.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9017674 + ... + 9039705.

Almost surely, 2^198920087064 is an apocalyptic number.

It is an amenable number.

198920087064 is an abundant number, since it is smaller than the sum of its proper divisors (391014517536).

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

198920087064 is a wasteful number, since it uses less digits than its factorization.

198920087064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18057414 (or 18057401 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 198920087064 in words is "one hundred ninety-eight billion, nine hundred twenty million, eighty-seven thousand, sixty-four".