198628668 has 36 divisors (see below), whose sum is σ = 573816880. Its totient is φ = 56750976.

The previous prime is 198628657. The next prime is 198628681. The reversal of 198628668 is 866826891.

It is a happy number.

198628668 is a `hidden beast` number, since 1 + 9 + 8 + 628 + 6 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393853 + ... + 394356.

Almost surely, 2^198628668 is an apocalyptic number.

198628668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

198628668 is an abundant number, since it is smaller than the sum of its proper divisors (375188212).

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

198628668 is a wasteful number, since it uses less digits than its factorization.

198628668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788226 (or 788221 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 198628668 is about 14093.5683203368. The cubic root of 198628668 is about 583.4638813848.

The spelling of 198628668 in words is "one hundred ninety-eight million, six hundred twenty-eight thousand, six hundred sixty-eight".