129423609906928 has 120 divisors (see below), whose sum is σ = 263915592785280. Its totient is φ = 61470184406400.

The previous prime is 129423609906907. The next prime is 129423609906977. The reversal of 129423609906928 is 829609906324921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 247553863 + ... + 248076121.

It is an arithmetic number, because the mean of its divisors is an integer number (2199296606544).

Almost surely, 2^{129423609906928} 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 129423609906928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131957796392640).

129423609906928 is an abundant number, since it is smaller than the sum of its proper divisors (134491982878352).

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

129423609906928 is a wasteful number, since it uses less digits than its factorization.

129423609906928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522627 (or 522590 counting only the distinct ones).

The product of its (nonzero) digits is 181398528, while the sum is 70.

The spelling of 129423609906928 in words is "one hundred twenty-nine trillion, four hundred twenty-three billion, six hundred nine million, nine hundred six thousand, nine hundred twenty-eight".