129361680 has 120 divisors (see below), whose sum is σ = 496521792. Its totient is φ = 29567232.

The previous prime is 129361679. The next prime is 129361691. The reversal of 129361680 is 86163921.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7794 + ... + 17873.

Almost surely, 2^129361680 is an apocalyptic number.

129361680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129361680 is an abundant number, since it is smaller than the sum of its proper divisors (367160112).

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

129361680 is a wasteful number, since it uses less digits than its factorization.

129361680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25693 (or 25684 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 129361680 is about 11373.7276211451. The cubic root of 129361680 is about 505.7492130567.

The spelling of 129361680 in words is "one hundred twenty-nine million, three hundred sixty-one thousand, six hundred eighty".