129680 has 20 divisors (see below), whose sum is σ = 301692. Its totient is φ = 51840.

The previous prime is 129671. The next prime is 129707. The reversal of 129680 is 86921.

It can be written as a sum of positive squares in 2 ways, for example, as 73984 + 55696 = 272^2 + 236^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

129680 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731 + ... + 890.

2¹²⁹⁶⁸⁰ is an apocalyptic number.

129680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129680 is an abundant number, since it is smaller than the sum of its proper divisors (172012).

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

129680 is a wasteful number, since it uses less digits than its factorization.

129680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 129680 is about 360.1110939696. Note that the first 3 decimals coincide. The cubic root of 129680 is about 50.6163705253.

The spelling of 129680 in words is "one hundred twenty-nine thousand, six hundred eighty".