128711656 has 8 divisors (see below), whose sum is σ = 241334370. Its totient is φ = 64355824.

The previous prime is 128711621. The next prime is 128711663. The reversal of 128711656 is 656117821.

It can be written as a sum of positive squares in only one way, i.e., 126562500 + 2149156 = 11250^2 + 1466^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8044471 + ... + 8044486.

Almost surely, 2^128711656 is an apocalyptic number.

It is an amenable number.

128711656 is a deficient number, since it is larger than the sum of its proper divisors (112622714).

128711656 is a wasteful number, since it uses less digits than its factorization.

128711656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16088963 (or 16088959 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 128711656 is about 11345.1159535723. The cubic root of 128711656 is about 504.9006843220.

The spelling of 128711656 in words is "one hundred twenty-eight million, seven hundred eleven thousand, six hundred fifty-six".