128812668 has 24 divisors (see below), whose sum is σ = 300951168. Its totient is φ = 42882096.

The previous prime is 128812591. The next prime is 128812669. The reversal of 128812668 is 866218821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128812669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3355 + ... + 16397.

It is an arithmetic number, because the mean of its divisors is an integer number (12539632).

Almost surely, 2^128812668 is an apocalyptic number.

It is an amenable number.

128812668 is an abundant number, since it is smaller than the sum of its proper divisors (172138500).

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

128812668 is a wasteful number, since it uses less digits than its factorization.

128812668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13873 (or 13871 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 128812668 is about 11349.5668639821. The cubic root of 128812668 is about 505.0327306172.

The spelling of 128812668 in words is "one hundred twenty-eight million, eight hundred twelve thousand, six hundred sixty-eight".