129688320 has 72 divisors (see below), whose sum is σ = 414204336. Its totient is φ = 34582528.

The previous prime is 129688303. The next prime is 129688333. The reversal of 129688320 is 23886921.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13047 + ... + 20726.

It is an arithmetic number, because the mean of its divisors is an integer number (5752838).

Almost surely, 2^129688320 is an apocalyptic number.

129688320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129688320 is an abundant number, since it is smaller than the sum of its proper divisors (284516016).

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

129688320 is an equidigital number, since it uses as much as digits as its factorization.

129688320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33797 (or 33783 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 129688320 is about 11388.0779765507. The cubic root of 129688320 is about 506.1745298258.

The spelling of 129688320 in words is "one hundred twenty-nine million, six hundred eighty-eight thousand, three hundred twenty".