128685135 has 16 divisors (see below), whose sum is σ = 206515296. Its totient is φ = 68425728.

The previous prime is 128685133. The next prime is 128685169. The reversal of 128685135 is 531586821.

It is not a de Polignac number, because 128685135 - 2¹ = 128685133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128685093 and 128685102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128685131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7674 + ... + 17783.

It is an arithmetic number, because the mean of its divisors is an integer number (12907206).

Almost surely, 2^128685135 is an apocalyptic number.

128685135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128685135 is a deficient number, since it is larger than the sum of its proper divisors (77830161).

128685135 is a wasteful number, since it uses less digits than its factorization.

128685135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25802.

The product of its digits is 57600, while the sum is 39.

The square root of 128685135 is about 11343.9470644040. The cubic root of 128685135 is about 504.8660037259.

The spelling of 128685135 in words is "one hundred twenty-eight million, six hundred eighty-five thousand, one hundred thirty-five".