129770128 has 40 divisors (see below), whose sum is σ = 261233280. Its totient is φ = 62375040.

The previous prime is 129770111. The next prime is 129770141. The reversal of 129770128 is 821077921.

It is a super-2 number, since 2×129770128² = 33680572242272768, which contains 22 as substring.

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, 141993 + ... + 142903.

It is an arithmetic number, because the mean of its divisors is an integer number (6530832).

Almost surely, 2^129770128 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 129770128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130616640).

129770128 is an abundant number, since it is smaller than the sum of its proper divisors (131463152).

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

129770128 is a wasteful number, since it uses less digits than its factorization.

129770128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255 (or 1249 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 129770128 is about 11391.6692367712. The cubic root of 129770128 is about 506.2809398761.

The spelling of 129770128 in words is "one hundred twenty-nine million, seven hundred seventy thousand, one hundred twenty-eight".