129568208 has 80 divisors (see below), whose sum is σ = 314979840. Its totient is φ = 50160000.

The previous prime is 129568207. The next prime is 129568213. The reversal of 129568208 is 802865921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129568207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309023 + ... + 309441.

It is an arithmetic number, because the mean of its divisors is an integer number (3937248).

Almost surely, 2^129568208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129568208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157489920).

129568208 is an abundant number, since it is smaller than the sum of its proper divisors (185411632).

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

129568208 is a wasteful number, since it uses less digits than its factorization.

129568208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 690 counting only the distinct ones).

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

The square root of 129568208 is about 11382.8031696942. The cubic root of 129568208 is about 506.0182155326.

The spelling of 129568208 in words is "one hundred twenty-nine million, five hundred sixty-eight thousand, two hundred eight".