129680827 has 4 divisors (see below), whose sum is σ = 132843816. Its totient is φ = 126517840.

The previous prime is 129680821. The next prime is 129680839. The reversal of 129680827 is 728086921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129680827 - 2¹¹ = 129678779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129680821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1581433 + ... + 1581514.

It is an arithmetic number, because the mean of its divisors is an integer number (33210954).

Almost surely, 2^129680827 is an apocalyptic number.

129680827 is a deficient number, since it is larger than the sum of its proper divisors (3162989).

129680827 is an equidigital number, since it uses as much as digits as its factorization.

129680827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162988.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 129680827 is about 11387.7489873987. The cubic root of 129680827 is about 506.1647812254.

The spelling of 129680827 in words is "one hundred twenty-nine million, six hundred eighty thousand, eight hundred twenty-seven".