128395656 has 24 divisors (see below), whose sum is σ = 347738430. Its totient is φ = 42798528.

The previous prime is 128395639. The next prime is 128395691. The reversal of 128395656 is 656593821.

128395656 is a `hidden beast` number, since 1 + 2 + 83 + 9 + 565 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 115218756 + 13176900 = 10734^2 + 3630^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 891565 + ... + 891708.

Almost surely, 2^128395656 is an apocalyptic number.

It is an amenable number.

128395656 is an abundant number, since it is smaller than the sum of its proper divisors (219342774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128395656 is a wasteful number, since it uses less digits than its factorization.

128395656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783285 (or 1783278 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 128395656 is about 11331.1806975266. The cubic root of 128395656 is about 504.4871518084.

The spelling of 128395656 in words is "one hundred twenty-eight million, three hundred ninety-five thousand, six hundred fifty-six".