128989166 has 16 divisors (see below), whose sum is σ = 206859744. Its totient is φ = 60109824.

The previous prime is 128989127. The next prime is 128989177. The reversal of 128989166 is 661989821.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 14915 + ... + 21918.

It is an arithmetic number, because the mean of its divisors is an integer number (12928734).

Almost surely, 2^128989166 is an apocalyptic number.

128989166 is a deficient number, since it is larger than the sum of its proper divisors (77870578).

128989166 is a wasteful number, since it uses less digits than its factorization.

128989166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36955.

The product of its digits is 373248, while the sum is 50.

The square root of 128989166 is about 11357.3397413303. The cubic root of 128989166 is about 505.2632891679.

The spelling of 128989166 in words is "one hundred twenty-eight million, nine hundred eighty-nine thousand, one hundred sixty-six".