128163656 has 8 divisors (see below), whose sum is σ = 240306870. Its totient is φ = 64081824.

The previous prime is 128163643. The next prime is 128163661. The reversal of 128163656 is 656361821.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 56761156 = 8450^2 + 7534^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010221 + ... + 8010236.

Almost surely, 2^128163656 is an apocalyptic number.

It is an amenable number.

128163656 is a deficient number, since it is larger than the sum of its proper divisors (112143214).

128163656 is a wasteful number, since it uses less digits than its factorization.

128163656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16020463 (or 16020459 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 128163656 is about 11320.9388303267. The cubic root of 128163656 is about 504.1831135252.

The spelling of 128163656 in words is "one hundred twenty-eight million, one hundred sixty-three thousand, six hundred fifty-six".