129251328 has 96 divisors (see below), whose sum is σ = 349549200. Its totient is φ = 42467328.

The previous prime is 129251267. The next prime is 129251333. The reversal of 129251328 is 823152921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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, 669600 + ... + 669792.

Almost surely, 2^129251328 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 129251328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174774600).

129251328 is an abundant number, since it is smaller than the sum of its proper divisors (220297872).

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

129251328 is a wasteful number, since it uses less digits than its factorization.

129251328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 307 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 129251328 is about 11368.8754061253. The cubic root of 129251328 is about 505.6053623316.

The spelling of 129251328 in words is "one hundred twenty-nine million, two hundred fifty-one thousand, three hundred twenty-eight".