129728968 has 8 divisors (see below), whose sum is σ = 243241830. Its totient is φ = 64864480.

The previous prime is 129728959. The next prime is 129728969. The reversal of 129728968 is 869827921.

It can be written as a sum of positive squares in only one way, i.e., 124055044 + 5673924 = 11138^2 + 2382^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (129728969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8108053 + ... + 8108068.

Almost surely, 2^129728968 is an apocalyptic number.

It is an amenable number.

129728968 is a deficient number, since it is larger than the sum of its proper divisors (113512862).

129728968 is a wasteful number, since it uses less digits than its factorization.

129728968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16216127 (or 16216123 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 129728968 is about 11389.8625101447. The cubic root of 129728968 is about 506.2274074559.

The spelling of 129728968 in words is "one hundred twenty-nine million, seven hundred twenty-eight thousand, nine hundred sixty-eight".