129357928 has 32 divisors (see below), whose sum is σ = 291787200. Its totient is φ = 52520832.

The previous prime is 129357901. The next prime is 129357929. The reversal of 129357928 is 829753921.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (129357929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59725 + ... + 61852.

It is an arithmetic number, because the mean of its divisors is an integer number (9118350).

Almost surely, 2^129357928 is an apocalyptic number.

It is an amenable number.

129357928 is an abundant number, since it is smaller than the sum of its proper divisors (162429272).

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

129357928 is a wasteful number, since it uses less digits than its factorization.

129357928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121609 (or 121605 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 129357928 is about 11373.5626784223. The cubic root of 129357928 is about 505.7443234341.

The spelling of 129357928 in words is "one hundred twenty-nine million, three hundred fifty-seven thousand, nine hundred twenty-eight".