129308668 has 12 divisors (see below), whose sum is σ = 236129040. Its totient is φ = 61843232.

The previous prime is 129308639. The next prime is 129308687. The reversal of 129308668 is 866803921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702673 + ... + 702856.

It is an arithmetic number, because the mean of its divisors is an integer number (19677420).

Almost surely, 2^129308668 is an apocalyptic number.

It is an amenable number.

129308668 is a deficient number, since it is larger than the sum of its proper divisors (106820372).

129308668 is a wasteful number, since it uses less digits than its factorization.

129308668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405556 (or 1405554 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 129308668 is about 11371.3969238612. The cubic root of 129308668 is about 505.6801188179.

The spelling of 129308668 in words is "one hundred twenty-nine million, three hundred eight thousand, six hundred sixty-eight".