128253668 has 12 divisors (see below), whose sum is σ = 224713020. Its totient is φ = 64049952.

The previous prime is 128253623. The next prime is 128253673. The reversal of 128253668 is 866352821.

It can be written as a sum of positive squares in 2 ways, for example, as 41242084 + 87011584 = 6422^2 + 9328^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15383 + ... + 22206.

It is an arithmetic number, because the mean of its divisors is an integer number (18726085).

Almost surely, 2^128253668 is an apocalyptic number.

It is an amenable number.

128253668 is a deficient number, since it is larger than the sum of its proper divisors (96459352).

128253668 is a wasteful number, since it uses less digits than its factorization.

128253668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38446 (or 38444 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 128253668 is about 11324.9135979044. The cubic root of 128253668 is about 504.3011186644.

The spelling of 128253668 in words is "one hundred twenty-eight million, two hundred fifty-three thousand, six hundred sixty-eight".