128945685 has 32 divisors (see below), whose sum is σ = 236920320. Its totient is φ = 59227200.

The previous prime is 128945681. The next prime is 128945699. The reversal of 128945685 is 586549821.

It is not a de Polignac number, because 128945685 - 2² = 128945681 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128945681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17431 + ... + 23700.

It is an arithmetic number, because the mean of its divisors is an integer number (7403760).

Almost surely, 2^128945685 is an apocalyptic number.

128945685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128945685 is a deficient number, since it is larger than the sum of its proper divisors (107974635).

128945685 is a wasteful number, since it uses less digits than its factorization.

128945685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41169.

The product of its digits is 691200, while the sum is 48.

The square root of 128945685 is about 11355.4253553092. The cubic root of 128945685 is about 505.2065096652.

The spelling of 128945685 in words is "one hundred twenty-eight million, nine hundred forty-five thousand, six hundred eighty-five".