129756928 has 144 divisors (see below), whose sum is σ = 323115520. Its totient is φ = 50761728.

The previous prime is 129756919. The next prime is 129756931. The reversal of 129756928 is 829657921.

Its product of digits (544320) is a multiple of the sum of its prime divisors (168).

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, 1259725 + ... + 1259827.

Almost surely, 2^129756928 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 129756928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161557760).

129756928 is an abundant number, since it is smaller than the sum of its proper divisors (193358592).

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

129756928 is a wasteful number, since it uses less digits than its factorization.

129756928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 168 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

The square root of 129756928 is about 11391.0898512829. The cubic root of 129756928 is about 506.2637732777.

The spelling of 129756928 in words is "one hundred twenty-nine million, seven hundred fifty-six thousand, nine hundred twenty-eight".