129028956936 has 96 divisors (see below), whose sum is σ = 355277580000. Its totient is φ = 39020889600.

The previous prime is 129028956923. The next prime is 129028956961. The reversal of 129028956936 is 639659820921.

It is a self number, because there is not a number n which added to its sum of digits gives 129028956936.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1404576 + ... + 1493616.

It is an arithmetic number, because the mean of its divisors is an integer number (3700808125).

Almost surely, 2^129028956936 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 129028956936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177638790000).

129028956936 is an abundant number, since it is smaller than the sum of its proper divisors (226248623064).

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

129028956936 is a wasteful number, since it uses less digits than its factorization.

129028956936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89571 (or 89556 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 60.

The spelling of 129028956936 in words is "one hundred twenty-nine billion, twenty-eight million, nine hundred fifty-six thousand, nine hundred thirty-six".