129617295728 has 40 divisors (see below), whose sum is σ = 259448810880. Its totient is φ = 62666219520.

The previous prime is 129617295713. The next prime is 129617295749. The reversal of 129617295728 is 827592716921.

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, 496268 + ... + 710996.

It is an arithmetic number, because the mean of its divisors is an integer number (6486220272).

Almost surely, 2^129617295728 is an apocalyptic number.

It is an amenable number.

129617295728 is an abundant number, since it is smaller than the sum of its proper divisors (129831515152).

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

129617295728 is a wasteful number, since it uses less digits than its factorization.

129617295728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215985 (or 215979 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 59.

The spelling of 129617295728 in words is "one hundred twenty-nine billion, six hundred seventeen million, two hundred ninety-five thousand, seven hundred twenty-eight".