129671268 has 12 divisors (see below), whose sum is σ = 302566320. Its totient is φ = 43223752.

The previous prime is 129671239. The next prime is 129671279. The reversal of 129671268 is 862176921.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5402958 + ... + 5402981.

It is an arithmetic number, because the mean of its divisors is an integer number (25213860).

Almost surely, 2^129671268 is an apocalyptic number.

It is an amenable number.

129671268 is an abundant number, since it is smaller than the sum of its proper divisors (172895052).

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

129671268 is a wasteful number, since it uses less digits than its factorization.

129671268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10805946 (or 10805944 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 129671268 is about 11387.3292742416. The cubic root of 129671268 is about 506.1523441568.

The spelling of 129671268 in words is "one hundred twenty-nine million, six hundred seventy-one thousand, two hundred sixty-eight".