129688216 has 16 divisors (see below), whose sum is σ = 277903440. Its totient is φ = 55580640.

The previous prime is 129688211. The next prime is 129688231. The reversal of 129688216 is 612886921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129688211) 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, 1157875 + ... + 1157986.

It is an arithmetic number, because the mean of its divisors is an integer number (17368965).

Almost surely, 2^129688216 is an apocalyptic number.

It is an amenable number.

129688216 is an abundant number, since it is smaller than the sum of its proper divisors (148215224).

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

129688216 is a wasteful number, since it uses less digits than its factorization.

129688216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315874 (or 2315870 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 129688216 is about 11388.0734103710. The cubic root of 129688216 is about 506.1743945214.

The spelling of 129688216 in words is "one hundred twenty-nine million, six hundred eighty-eight thousand, two hundred sixteen".