128689959 has 32 divisors (see below), whose sum is σ = 183859200. Its totient is φ = 79920000.

The previous prime is 128689943. The next prime is 128689987. The reversal of 128689959 is 959986821.

It is not a de Polignac number, because 128689959 - 2⁴ = 128689943 is a prime.

It is a super-2 number, since 2×128689959² = 33122211094843362, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128689899 and 128689908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128689909) 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 31 ways as a sum of consecutive naturals, for example, 512584 + ... + 512834.

It is an arithmetic number, because the mean of its divisors is an integer number (5745600).

Almost surely, 2^128689959 is an apocalyptic number.

128689959 is a deficient number, since it is larger than the sum of its proper divisors (55169241).

128689959 is a wasteful number, since it uses less digits than its factorization.

128689959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471.

The product of its digits is 2799360, while the sum is 57.

The square root of 128689959 is about 11344.1596868168. The cubic root of 128689959 is about 504.8723122586.

The spelling of 128689959 in words is "one hundred twenty-eight million, six hundred eighty-nine thousand, nine hundred fifty-nine".