128685011 has 16 divisors (see below), whose sum is σ = 160171200. Its totient is φ = 100666368.

The previous prime is 128684987. The next prime is 128685017. The reversal of 128685011 is 110586821.

It is a cyclic number.

It is not a de Polignac number, because 128685011 - 2²⁶ = 61576147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128685017) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 155 + ... + 16043.

It is an arithmetic number, because the mean of its divisors is an integer number (10010700).

Almost surely, 2^128685011 is an apocalyptic number.

128685011 is a deficient number, since it is larger than the sum of its proper divisors (31486189).

128685011 is a wasteful number, since it uses less digits than its factorization.

128685011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15998.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 128685011 is about 11343.9415989329. The cubic root of 128685011 is about 504.8658415642.

The spelling of 128685011 in words is "one hundred twenty-eight million, six hundred eighty-five thousand, eleven".