198820207728 has 120 divisors (see below), whose sum is σ = 594175720320. Its totient is φ = 61923939840.

The previous prime is 198820207709. The next prime is 198820207783. The reversal of 198820207728 is 827702028891.

198820207728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 638451 + ... + 897362.

It is an arithmetic number, because the mean of its divisors is an integer number (4951464336).

Almost surely, 2^198820207728 is an apocalyptic number.

198820207728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

198820207728 is an abundant number, since it is smaller than the sum of its proper divisors (395355512592).

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

198820207728 is a wasteful number, since it uses less digits than its factorization.

198820207728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535887 (or 1535878 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 54.

The spelling of 198820207728 in words is "one hundred ninety-eight billion, eight hundred twenty million, two hundred seven thousand, seven hundred twenty-eight".