198715668 has 24 divisors (see below), whose sum is σ = 464011968. Its totient is φ = 66189696.

The previous prime is 198715637. The next prime is 198715679. The reversal of 198715668 is 866517891.

It is a self number, because there is not a number n which added to its sum of digits gives 198715668.

It is a congruent number.

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, 13305 + ... + 23967.

It is an arithmetic number, because the mean of its divisors is an integer number (19333832).

Almost surely, 2^198715668 is an apocalyptic number.

It is an amenable number.

198715668 is an abundant number, since it is smaller than the sum of its proper divisors (265296300).

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

198715668 is a wasteful number, since it uses less digits than its factorization.

198715668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12223 (or 12221 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 198715668 is about 14096.6544967237. The cubic root of 198715668 is about 583.5490553072.

The spelling of 198715668 in words is "one hundred ninety-eight million, seven hundred fifteen thousand, six hundred sixty-eight".