129820568 has 32 divisors (see below), whose sum is σ = 264708000. Its totient is φ = 59438592.

The previous prime is 129820567. The next prime is 129820577. The reversal of 129820568 is 865028921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129820567) 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 7 ways as a sum of consecutive naturals, for example, 7868 + ... + 17931.

It is an arithmetic number, because the mean of its divisors is an integer number (8272125).

Almost surely, 2^129820568 is an apocalyptic number.

It is an amenable number.

129820568 is an abundant number, since it is smaller than the sum of its proper divisors (134887432).

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

129820568 is a wasteful number, since it uses less digits than its factorization.

129820568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25859 (or 25855 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 129820568 is about 11393.8829202340. The cubic root of 129820568 is about 506.3465263689.

The spelling of 129820568 in words is "one hundred twenty-nine million, eight hundred twenty thousand, five hundred sixty-eight".