198591008 has 144 divisors (see below), whose sum is σ = 521240832. Its totient is φ = 72652800.

The previous prime is 198590999. The next prime is 198591011. The reversal of 198591008 is 800195891.

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 23 ways as a sum of consecutive naturals, for example, 460553 + ... + 460983.

It is an arithmetic number, because the mean of its divisors is an integer number (3619728).

Almost surely, 2^198591008 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 198591008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260620416).

198591008 is an abundant number, since it is smaller than the sum of its proper divisors (322649824).

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

198591008 is a wasteful number, since it uses less digits than its factorization.

198591008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 198591008 is about 14092.2321865629. The cubic root of 198591008 is about 583.4270041323.

The spelling of 198591008 in words is "one hundred ninety-eight million, five hundred ninety-one thousand, eight".