129578272 has 24 divisors (see below), whose sum is σ = 258186096. Its totient is φ = 64007232.

The previous prime is 129578263. The next prime is 129578287. The reversal of 129578272 is 272875921.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21738 + ... + 27049.

It is an arithmetic number, because the mean of its divisors is an integer number (10757754).

Almost surely, 2^129578272 is an apocalyptic number.

It is an amenable number.

129578272 is a deficient number, since it is larger than the sum of its proper divisors (128607824).

129578272 is an equidigital number, since it uses as much as digits as its factorization.

129578272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48880 (or 48872 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 129578272 is about 11383.2452314795. The cubic root of 129578272 is about 506.0313165743.

The spelling of 129578272 in words is "one hundred twenty-nine million, five hundred seventy-eight thousand, two hundred seventy-two".