128189668 has 12 divisors (see below), whose sum is σ = 226390780. Its totient is φ = 63506592.

The previous prime is 128189641. The next prime is 128189687. The reversal of 128189668 is 866981821.

It can be written as a sum of positive squares in 2 ways, for example, as 52881984 + 75307684 = 7272^2 + 8678^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146571 + ... + 147442.

Almost surely, 2^128189668 is an apocalyptic number.

It is an amenable number.

128189668 is a deficient number, since it is larger than the sum of its proper divisors (98201112).

128189668 is a wasteful number, since it uses less digits than its factorization.

128189668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294126 (or 294124 counting only the distinct ones).

The product of its digits is 331776, while the sum is 49.

The square root of 128189668 is about 11322.0876166898. The cubic root of 128189668 is about 504.2172207607.

The spelling of 128189668 in words is "one hundred twenty-eight million, one hundred eighty-nine thousand, six hundred sixty-eight".