128681166 has 16 divisors (see below), whose sum is σ = 258344064. Its totient is φ = 42730104.

The previous prime is 128681141. The next prime is 128681173. The reversal of 128681166 is 661186821.

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, 39196 + ... + 42351.

It is an arithmetic number, because the mean of its divisors is an integer number (16146504).

Almost surely, 2^128681166 is an apocalyptic number.

128681166 is an abundant number, since it is smaller than the sum of its proper divisors (129662898).

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

128681166 is a wasteful number, since it uses less digits than its factorization.

128681166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81815.

The product of its digits is 27648, while the sum is 39.

The square root of 128681166 is about 11343.7721239454. The cubic root of 128681166 is about 504.8608131917.

The spelling of 128681166 in words is "one hundred twenty-eight million, six hundred eighty-one thousand, one hundred sixty-six".