129233868 has 24 divisors (see below), whose sum is σ = 306490800. Its totient is φ = 42371520.

The previous prime is 129233857. The next prime is 129233869. The reversal of 129233868 is 868332921.

It is not an unprimeable number, because it can be changed into a prime (129233869) 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, 87543 + ... + 89006.

It is an arithmetic number, because the mean of its divisors is an integer number (12770450).

Almost surely, 2^129233868 is an apocalyptic number.

It is an amenable number.

129233868 is an abundant number, since it is smaller than the sum of its proper divisors (177256932).

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

129233868 is a wasteful number, since it uses less digits than its factorization.

129233868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176617 (or 176615 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 129233868 is about 11368.1074942138. The cubic root of 129233868 is about 505.5825946296.

The spelling of 129233868 in words is "one hundred twenty-nine million, two hundred thirty-three thousand, eight hundred sixty-eight".