198775590 has 32 divisors (see below), whose sum is σ = 513759456. Its totient is φ = 48929280.

The previous prime is 198775589. The next prime is 198775607. The reversal of 198775590 is 95577891.

198775590 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254451 + ... + 255230.

It is an arithmetic number, because the mean of its divisors is an integer number (16054983).

Almost surely, 2^198775590 is an apocalyptic number.

198775590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198775590 is an abundant number, since it is smaller than the sum of its proper divisors (314983866).

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

198775590 is a wasteful number, since it uses less digits than its factorization.

198775590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509704.

The product of its (nonzero) digits is 793800, while the sum is 51.

The square root of 198775590 is about 14098.7797344309. The cubic root of 198775590 is about 583.6077051236.

It can be divided in two parts, 1987 and 75590, that added together give a palindrome (77577).

The spelling of 198775590 in words is "one hundred ninety-eight million, seven hundred seventy-five thousand, five hundred ninety".