129328057 has 4 divisors (see below), whose sum is σ = 134951040. Its totient is φ = 123705076.

The previous prime is 129328051. The next prime is 129328097. The reversal of 129328057 is 750823921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129328057 - 2⁷ = 129327929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129328051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2811457 + ... + 2811502.

It is an arithmetic number, because the mean of its divisors is an integer number (33737760).

Almost surely, 2^129328057 is an apocalyptic number.

It is an amenable number.

129328057 is a deficient number, since it is larger than the sum of its proper divisors (5622983).

129328057 is an equidigital number, since it uses as much as digits as its factorization.

129328057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5622982.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 129328057 is about 11372.2494256853. The cubic root of 129328057 is about 505.7053920445.

The spelling of 129328057 in words is "one hundred twenty-nine million, three hundred twenty-eight thousand, fifty-seven".