128268928 has 16 divisors (see below), whose sum is σ = 255536010. Its totient is φ = 64134400.

The previous prime is 128268923. The next prime is 128268929. The reversal of 128268928 is 829862821.

It can be written as a sum of positive squares in only one way, i.e., 65415744 + 62853184 = 8088^2 + 7928^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (128268923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500923 + ... + 501178.

Almost surely, 2^128268928 is an apocalyptic number.

It is an amenable number.

128268928 is a deficient number, since it is larger than the sum of its proper divisors (127267082).

128268928 is an equidigital number, since it uses as much as digits as its factorization.

128268928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002115 (or 1002103 counting only the distinct ones).

The product of its digits is 221184, while the sum is 46.

The square root of 128268928 is about 11325.5873136893. The cubic root of 128268928 is about 504.3211189497.

The spelling of 128268928 in words is "one hundred twenty-eight million, two hundred sixty-eight thousand, nine hundred twenty-eight".