128229668 has 18 divisors (see below), whose sum is σ = 261039366. Its totient is φ = 54955488.

The previous prime is 128229659. The next prime is 128229697. The reversal of 128229668 is 866922821.

It can be written as a sum of positive squares in only one way, i.e., 127961344 + 268324 = 11312^2 + 518^2 .

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 5 ways as a sum of consecutive naturals, for example, 326921 + ... + 327312.

It is an arithmetic number, because the mean of its divisors is an integer number (14502187).

Almost surely, 2^128229668 is an apocalyptic number.

It is an amenable number.

128229668 is an abundant number, since it is smaller than the sum of its proper divisors (132809698).

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

128229668 is a wasteful number, since it uses less digits than its factorization.

128229668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654251 (or 654242 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 128229668 is about 11323.8539375956. The cubic root of 128229668 is about 504.2696602220.

The spelling of 128229668 in words is "one hundred twenty-eight million, two hundred twenty-nine thousand, six hundred sixty-eight".