129973328 has 60 divisors (see below), whose sum is σ = 265965120. Its totient is φ = 61513920.

The previous prime is 129973309. The next prime is 129973351. The reversal of 129973328 is 823379921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1214651 + ... + 1214757.

It is an arithmetic number, because the mean of its divisors is an integer number (4432752).

Almost surely, 2^129973328 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 129973328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132982560).

129973328 is an abundant number, since it is smaller than the sum of its proper divisors (135991792).

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

129973328 is a wasteful number, since it uses less digits than its factorization.

129973328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 219 counting only the distinct ones).

The product of its digits is 163296, while the sum is 44.

The square root of 129973328 is about 11400.5845464169. The cubic root of 129973328 is about 506.5450546845.

The spelling of 129973328 in words is "one hundred twenty-nine million, nine hundred seventy-three thousand, three hundred twenty-eight".