128585985 has 64 divisors (see below), whose sum is σ = 241975296. Its totient is φ = 57657600.

The previous prime is 128585959. The next prime is 128585993. The reversal of 128585985 is 589585821.

It is not a de Polignac number, because 128585985 - 2¹⁴ = 128569601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 117099 + ... + 118191.

It is an arithmetic number, because the mean of its divisors is an integer number (3780864).

Almost surely, 2^128585985 is an apocalyptic number.

128585985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128585985 is a deficient number, since it is larger than the sum of its proper divisors (113389311).

128585985 is a wasteful number, since it uses less digits than its factorization.

128585985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166.

The product of its digits is 1152000, while the sum is 51.

The square root of 128585985 is about 11339.5760502763. The cubic root of 128585985 is about 504.7363064718.

The spelling of 128585985 in words is "one hundred twenty-eight million, five hundred eighty-five thousand, nine hundred eighty-five".