128605656 has 16 divisors (see below), whose sum is σ = 321514200. Its totient is φ = 42868544.

The previous prime is 128605649. The next prime is 128605657. The reversal of 128605656 is 656506821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128605657) 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, 2679261 + ... + 2679308.

Almost surely, 2^128605656 is an apocalyptic number.

It is an amenable number.

128605656 is an abundant number, since it is smaller than the sum of its proper divisors (192908544).

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

128605656 is a wasteful number, since it uses less digits than its factorization.

128605656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358578 (or 5358574 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 128605656 is about 11340.4433775757. The cubic root of 128605656 is about 504.7620432363.

The spelling of 128605656 in words is "one hundred twenty-eight million, six hundred five thousand, six hundred fifty-six".