129688085 has 8 divisors (see below), whose sum is σ = 158562360. Its totient is φ = 101792704.

The previous prime is 129688079. The next prime is 129688109. The reversal of 129688085 is 580886921.

It can be written as a sum of positive squares in 4 ways, for example, as 44328964 + 85359121 = 6658^2 + 9239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129688085 - 2⁸ = 129687829 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244430 + ... + 244959.

It is an arithmetic number, because the mean of its divisors is an integer number (19820295).

Almost surely, 2^129688085 is an apocalyptic number.

It is an amenable number.

129688085 is a deficient number, since it is larger than the sum of its proper divisors (28874275).

129688085 is an equidigital number, since it uses as much as digits as its factorization.

129688085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489447.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 129688085 is about 11388.0676587382. The cubic root of 129688085 is about 506.1742240900.

The spelling of 129688085 in words is "one hundred twenty-nine million, six hundred eighty-eight thousand, eighty-five".