198618564 has 24 divisors (see below), whose sum is σ = 479424960. Its totient is φ = 63923104.

The previous prime is 198618557. The next prime is 198618617. The reversal of 198618564 is 465816891.

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, 285024 + ... + 285719.

It is an arithmetic number, because the mean of its divisors is an integer number (19976040).

Almost surely, 2^198618564 is an apocalyptic number.

It is an amenable number.

198618564 is an abundant number, since it is smaller than the sum of its proper divisors (280806396).

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

198618564 is a wasteful number, since it uses less digits than its factorization.

198618564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570779 (or 570777 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 198618564 is about 14093.2098543944. The cubic root of 198618564 is about 583.4539878498.

The spelling of 198618564 in words is "one hundred ninety-eight million, six hundred eighteen thousand, five hundred sixty-four".