129995668 has 36 divisors (see below), whose sum is σ = 263656512. Its totient is φ = 55607680.

The previous prime is 129995659. The next prime is 129995669. The reversal of 129995668 is 866599921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129995669) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 7605 + ... + 17827.

It is an arithmetic number, because the mean of its divisors is an integer number (7323792).

Almost surely, 2^129995668 is an apocalyptic number.

It is an amenable number.

129995668 is an abundant number, since it is smaller than the sum of its proper divisors (133660844).

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

129995668 is a wasteful number, since it uses less digits than its factorization.

129995668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10272 (or 10253 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 55.

The square root of 129995668 is about 11401.5642786418. The cubic root of 129995668 is about 506.5740749161.

The spelling of 129995668 in words is "one hundred twenty-nine million, nine hundred ninety-five thousand, six hundred sixty-eight".