990198220 has 24 divisors (see below), whose sum is σ = 2268454608. Its totient is φ = 360072000.

The previous prime is 990198179. The next prime is 990198233. The reversal of 990198220 is 22891099.

990198220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2250231 + ... + 2250670.

It is an arithmetic number, because the mean of its divisors is an integer number (94518942).

Almost surely, 2^990198220 is an apocalyptic number.

It is an amenable number.

990198220 is an abundant number, since it is smaller than the sum of its proper divisors (1278256388).

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

990198220 is a wasteful number, since it uses less digits than its factorization.

990198220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500921 (or 4500919 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 990198220 is about 31467.4152100232. The cubic root of 990198220 is about 996.7220064996.

The spelling of 990198220 in words is "nine hundred ninety million, one hundred ninety-eight thousand, two hundred twenty".