128606656 has 28 divisors (see below), whose sum is σ = 257476752. Its totient is φ = 63730688.

The previous prime is 128606651. The next prime is 128606657. The reversal of 128606656 is 656606821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128606651) 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, 1660 + ... + 16123.

Almost surely, 2^128606656 is an apocalyptic number.

128606656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128606656 is an abundant number, since it is smaller than the sum of its proper divisors (128870096).

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

128606656 is a wasteful number, since it uses less digits than its factorization.

128606656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17908 (or 17898 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 128606656 is about 11340.4874674769. The cubic root of 128606656 is about 504.7633515269.

The spelling of 128606656 in words is "one hundred twenty-eight million, six hundred six thousand, six hundred fifty-six".