129680266 has 16 divisors (see below), whose sum is σ = 200431368. Its totient is φ = 62899200.

The previous prime is 129680261. The next prime is 129680323. The reversal of 129680266 is 662086921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 106688241 + 22992025 = 10329^2 + 4795^2 .

It is not an unprimeable number, because it can be changed into a prime (129680261) 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, 1626 + ... + 16186.

Almost surely, 2^129680266 is an apocalyptic number.

129680266 is a deficient number, since it is larger than the sum of its proper divisors (70751102).

129680266 is a wasteful number, since it uses less digits than its factorization.

129680266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14697.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 129680266 is about 11387.7243556384. The cubic root of 129680266 is about 506.1640513338.

The spelling of 129680266 in words is "one hundred twenty-nine million, six hundred eighty thousand, two hundred sixty-six".