128645656 has 16 divisors (see below), whose sum is σ = 253906200. Its totient is φ = 60937344.

The previous prime is 128645651. The next prime is 128645663. The reversal of 128645656 is 656546821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128645651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423025 + ... + 423328.

Almost surely, 2^128645656 is an apocalyptic number.

It is an amenable number.

128645656 is a deficient number, since it is larger than the sum of its proper divisors (125260544).

128645656 is a wasteful number, since it uses less digits than its factorization.

128645656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846378 (or 846374 counting only the distinct ones).

The product of its digits is 345600, while the sum is 43.

The square root of 128645656 is about 11342.2068399408. The cubic root of 128645656 is about 504.8143695736.

The spelling of 128645656 in words is "one hundred twenty-eight million, six hundred forty-five thousand, six hundred fifty-six".