129872256 has 128 divisors (see below), whose sum is σ = 361398240. Its totient is φ = 41287680.

The previous prime is 129872227. The next prime is 129872261. The reversal of 129872256 is 652278921.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1149256 + ... + 1149368.

Almost surely, 2^129872256 is an apocalyptic number.

129872256 is a gapful number since it is divisible by the number (16) 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 129872256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180699120).

129872256 is an abundant number, since it is smaller than the sum of its proper divisors (231525984).

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

129872256 is a wasteful number, since it uses less digits than its factorization.

129872256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 232 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 129872256 is about 11396.1509291515. The cubic root of 129872256 is about 506.4137179985.

The spelling of 129872256 in words is "one hundred twenty-nine million, eight hundred seventy-two thousand, two hundred fifty-six".