198975564 has 18 divisors (see below), whose sum is σ = 502966100. Its totient is φ = 66325176.

The previous prime is 198975563. The next prime is 198975571. The reversal of 198975564 is 465579891.

198975564 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 75 + 564 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 198975564.

It is not an unprimeable number, because it can be changed into a prime (198975563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2763514 + ... + 2763585.

Almost surely, 2^198975564 is an apocalyptic number.

It is an amenable number.

198975564 is an abundant number, since it is smaller than the sum of its proper divisors (303990536).

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

198975564 is a wasteful number, since it uses less digits than its factorization.

198975564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5527109 (or 5527104 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The square root of 198975564 is about 14105.8698420197. The cubic root of 198975564 is about 583.8033482815.

The spelling of 198975564 in words is "one hundred ninety-eight million, nine hundred seventy-five thousand, five hundred sixty-four".