129520268 has 12 divisors (see below), whose sum is σ = 236515440. Its totient is φ = 61944432.

The previous prime is 129520253. The next prime is 129520309. The reversal of 129520268 is 862025921.

It is a happy number.

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, 703823 + ... + 704006.

It is an arithmetic number, because the mean of its divisors is an integer number (19709620).

Almost surely, 2^129520268 is an apocalyptic number.

It is an amenable number.

129520268 is a deficient number, since it is larger than the sum of its proper divisors (106995172).

129520268 is a wasteful number, since it uses less digits than its factorization.

129520268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407856 (or 1407854 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 129520268 is about 11380.6971666941. The cubic root of 129520268 is about 505.9557992292.

The spelling of 129520268 in words is "one hundred twenty-nine million, five hundred twenty thousand, two hundred sixty-eight".