128655689 has 8 divisors (see below), whose sum is σ = 130200000. Its totient is φ = 127120752.

The previous prime is 128655679. The next prime is 128655701. The reversal of 128655689 is 986556821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128655689 - 2¹⁶ = 128590153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128655619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27482 + ... + 31820.

It is an arithmetic number, because the mean of its divisors is an integer number (16275000).

Almost surely, 2^128655689 is an apocalyptic number.

It is an amenable number.

128655689 is a deficient number, since it is larger than the sum of its proper divisors (1544311).

128655689 is a wasteful number, since it uses less digits than its factorization.

128655689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687.

The product of its digits is 1036800, while the sum is 50.

The square root of 128655689 is about 11342.6491173799. The cubic root of 128655689 is about 504.8274926256.

The spelling of 128655689 in words is "one hundred twenty-eight million, six hundred fifty-five thousand, six hundred eighty-nine".