129681268 has 12 divisors (see below), whose sum is σ = 236809440. Its totient is φ = 62021432.

The previous prime is 129681239. The next prime is 129681311. The reversal of 129681268 is 862186921.

It is a happy number.

It is a congruent number.

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, 704698 + ... + 704881.

It is an arithmetic number, because the mean of its divisors is an integer number (19734120).

Almost surely, 2^129681268 is an apocalyptic number.

It is an amenable number.

129681268 is a deficient number, since it is larger than the sum of its proper divisors (107128172).

129681268 is a wasteful number, since it uses less digits than its factorization.

129681268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409606 (or 1409604 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 129681268 is about 11387.7683502959. The cubic root of 129681268 is about 506.1653549890.

The spelling of 129681268 in words is "one hundred twenty-nine million, six hundred eighty-one thousand, two hundred sixty-eight".