129528856 has 8 divisors (see below), whose sum is σ = 242866620. Its totient is φ = 64764424.

The previous prime is 129528827. The next prime is 129528859. The reversal of 129528856 is 658825921.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129528859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8095546 + ... + 8095561.

Almost surely, 2^129528856 is an apocalyptic number.

It is an amenable number.

129528856 is a deficient number, since it is larger than the sum of its proper divisors (113337764).

129528856 is a wasteful number, since it uses less digits than its factorization.

129528856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16191113 (or 16191109 counting only the distinct ones).

The product of its digits is 345600, while the sum is 46.

The square root of 129528856 is about 11381.0744659720. The cubic root of 129528856 is about 505.9669816550.

The spelling of 129528856 in words is "one hundred twenty-nine million, five hundred twenty-eight thousand, eight hundred fifty-six".