129768657 has 16 divisors (see below), whose sum is σ = 178036992. Its totient is φ = 84015360.

The previous prime is 129768641. The next prime is 129768659. The reversal of 129768657 is 756867921.

It is not a de Polignac number, because 129768657 - 2⁴ = 129768641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129768659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97128 + ... + 98454.

It is an arithmetic number, because the mean of its divisors is an integer number (11127312).

Almost surely, 2^129768657 is an apocalyptic number.

It is an amenable number.

129768657 is a deficient number, since it is larger than the sum of its proper divisors (48268335).

129768657 is a wasteful number, since it uses less digits than its factorization.

129768657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248.

The product of its digits is 1270080, while the sum is 51.

The square root of 129768657 is about 11391.6046718625. The cubic root of 129768657 is about 506.2790268984.

The spelling of 129768657 in words is "one hundred twenty-nine million, seven hundred sixty-eight thousand, six hundred fifty-seven".