128665588 has 24 divisors (see below), whose sum is σ = 248778432. Its totient is φ = 57915264.

The previous prime is 128665583. The next prime is 128665591. The reversal of 128665588 is 885566821.

It is a happy number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128665583) 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 7 ways as a sum of consecutive naturals, for example, 39570 + ... + 42697.

It is an arithmetic number, because the mean of its divisors is an integer number (10365768).

Almost surely, 2^128665588 is an apocalyptic number.

It is an amenable number.

128665588 is a deficient number, since it is larger than the sum of its proper divisors (120112844).

128665588 is a wasteful number, since it uses less digits than its factorization.

128665588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82311 (or 82309 counting only the distinct ones).

The product of its digits is 921600, while the sum is 49.

The square root of 128665588 is about 11343.0854708937. The cubic root of 128665588 is about 504.8404397385.

The spelling of 128665588 in words is "one hundred twenty-eight million, six hundred sixty-five thousand, five hundred eighty-eight".