129707568 has 120 divisors (see below), whose sum is σ = 382437328. Its totient is φ = 42550272.

The previous prime is 129707561. The next prime is 129707581. The reversal of 129707568 is 865707921.

129707568 is a `hidden beast` number, since 12 + 9 + 70 + 7 + 568 = 666.

It is not an unprimeable number, because it can be changed into a prime (129707561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 283596 + ... + 284052.

Almost surely, 2^129707568 is an apocalyptic number.

129707568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129707568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191218664).

129707568 is an abundant number, since it is smaller than the sum of its proper divisors (252729760).

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

129707568 is an equidigital number, since it uses as much as digits as its factorization.

129707568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 129707568 is about 11388.9230395152. The cubic root of 129707568 is about 506.1995702853.

The spelling of 129707568 in words is "one hundred twenty-nine million, seven hundred seven thousand, five hundred sixty-eight".