128666198 has 8 divisors (see below), whose sum is σ = 193102392. Its totient is φ = 64298736.

The previous prime is 128666189. The next prime is 128666221. The reversal of 128666198 is 891666821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12215 + ... + 20162.

It is an arithmetic number, because the mean of its divisors is an integer number (24137799).

Almost surely, 2^128666198 is an apocalyptic number.

128666198 is a deficient number, since it is larger than the sum of its proper divisors (64436194).

128666198 is a wasteful number, since it uses less digits than its factorization.

128666198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34366.

The product of its digits is 248832, while the sum is 47.

The square root of 128666198 is about 11343.1123594893. The cubic root of 128666198 is about 504.8412375488.

The spelling of 128666198 in words is "one hundred twenty-eight million, six hundred sixty-six thousand, one hundred ninety-eight".