128944656 has 40 divisors (see below), whose sum is σ = 370120160. Its totient is φ = 42981408.

The previous prime is 128944603. The next prime is 128944657. The reversal of 128944656 is 656449821.

It is not an unprimeable number, because it can be changed into a prime (128944657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148810 + ... + 149673.

It is an arithmetic number, because the mean of its divisors is an integer number (9253004).

Almost surely, 2^128944656 is an apocalyptic number.

128944656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128944656 is an abundant number, since it is smaller than the sum of its proper divisors (241175504).

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

128944656 is a wasteful number, since it uses less digits than its factorization.

128944656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298500 (or 298488 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 128944656 is about 11355.3800464802. The cubic root of 128944656 is about 505.2051657948.

It can be divided in two parts, 128944 and 656, that added together give a square (129600 = 360²).

The spelling of 128944656 in words is "one hundred twenty-eight million, nine hundred forty-four thousand, six hundred fifty-six".