128985818 has 16 divisors (see below), whose sum is σ = 210875616. Its totient is φ = 58813680.

The previous prime is 128985803. The next prime is 128985821. The reversal of 128985818 is 818589821.

It is a happy 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, 27728 + ... + 32043.

It is an arithmetic number, because the mean of its divisors is an integer number (13179726).

Almost surely, 2^128985818 is an apocalyptic number.

128985818 is a deficient number, since it is larger than the sum of its proper divisors (81889798).

128985818 is a wasteful number, since it uses less digits than its factorization.

128985818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59869.

The product of its digits is 368640, while the sum is 50.

The square root of 128985818 is about 11357.1923467026. The cubic root of 128985818 is about 505.2589176480.

The spelling of 128985818 in words is "one hundred twenty-eight million, nine hundred eighty-five thousand, eight hundred eighteen".