128812728 has 48 divisors (see below), whose sum is σ = 353976840. Its totient is φ = 39033280.

The previous prime is 128812721. The next prime is 128812741. The reversal of 128812728 is 827218821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128812721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19275 + ... + 25082.

Almost surely, 2^128812728 is an apocalyptic number.

It is an amenable number.

128812728 is an abundant number, since it is smaller than the sum of its proper divisors (225164112).

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

128812728 is a wasteful number, since it uses less digits than its factorization.

128812728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44388 (or 44373 counting only the distinct ones).

The product of its digits is 28672, while the sum is 39.

The square root of 128812728 is about 11349.5695072544. The cubic root of 128812728 is about 505.0328090307.

The spelling of 128812728 in words is "one hundred twenty-eight million, eight hundred twelve thousand, seven hundred twenty-eight".