198664 has 16 divisors (see below), whose sum is σ = 392400. Its totient is φ = 94032.

The previous prime is 198659. The next prime is 198673. The reversal of 198664 is 466891.

It is an unprimeable number.

198664 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502 + ... + 805.

It is an arithmetic number, because the mean of its divisors is an integer number (24525).

2¹⁹⁸⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

198664 is a deficient number, since it is larger than the sum of its proper divisors (193736).

198664 is a wasteful number, since it uses less digits than its factorization.

198664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1328 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 198664 is about 445.7173992565. The cubic root of 198664 is about 58.3498474786.

Multiplying 198664 by its sum of digits (34), we get a palindrome (6754576).

The spelling of 198664 in words is "one hundred ninety-eight thousand, six hundred sixty-four".