128963728 has 10 divisors (see below), whose sum is σ = 249867254. Its totient is φ = 64481856.

The previous prime is 128963707. The next prime is 128963729. The reversal of 128963728 is 827369821.

It can be written as a sum of positive squares in only one way, i.e., 128777104 + 186624 = 11348^2 + 432^2 .

It is not an unprimeable number, because it can be changed into a prime (128963729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4030101 + ... + 4030132.

Almost surely, 2^128963728 is an apocalyptic number.

It is an amenable number.

128963728 is a deficient number, since it is larger than the sum of its proper divisors (120903526).

128963728 is an equidigital number, since it uses as much as digits as its factorization.

128963728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8060241 (or 8060235 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 128963728 is about 11356.2197935757. The cubic root of 128963728 is about 505.2300725991.

The spelling of 128963728 in words is "one hundred twenty-eight million, nine hundred sixty-three thousand, seven hundred twenty-eight".