128555968 has 28 divisors (see below), whose sum is σ = 255747520. Its totient is φ = 64115712.

The previous prime is 128555963. The next prime is 128555969. The reversal of 128555968 is 869555821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128555963) 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, 25393 + ... + 30031.

It is an arithmetic number, because the mean of its divisors is an integer number (9133840).

Almost surely, 2^128555968 is an apocalyptic number.

It is an amenable number.

128555968 is a deficient number, since it is larger than the sum of its proper divisors (127191552).

128555968 is an equidigital number, since it uses as much as digits as its factorization.

128555968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5084 (or 5074 counting only the distinct ones).

The product of its digits is 864000, while the sum is 49.

The square root of 128555968 is about 11338.2524226620. The cubic root of 128555968 is about 504.6970283478.

The spelling of 128555968 in words is "one hundred twenty-eight million, five hundred fifty-five thousand, nine hundred sixty-eight".