129668 has 24 divisors (see below), whose sum is σ = 283584. Its totient is φ = 50400.

The previous prime is 129643. The next prime is 129671. The reversal of 129668 is 866921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98 + ... + 518.

It is an arithmetic number, because the mean of its divisors is an integer number (11816).

2¹²⁹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141792).

129668 is an abundant number, since it is smaller than the sum of its proper divisors (153916).

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

129668 is a wasteful number, since it uses less digits than its factorization.

129668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 441 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 129668 is about 360.0944320591. The cubic root of 129668 is about 50.6148092072.

It can be divided in two parts, 129 and 668, that added together give a palindrome (797).

The spelling of 129668 in words is "one hundred twenty-nine thousand, six hundred sixty-eight".