129696880 has 40 divisors (see below), whose sum is σ = 304234992. Its totient is φ = 51416064.

The previous prime is 129696863. The next prime is 129696881. The reversal of 129696880 is 88696921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129696881) by changing a digit.

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, 1867 + ... + 16213.

Almost surely, 2^129696880 is an apocalyptic number.

129696880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129696880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152117496).

129696880 is an abundant number, since it is smaller than the sum of its proper divisors (174538112).

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

129696880 is a wasteful number, since it uses less digits than its factorization.

129696880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14473 (or 14467 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 129696880 is about 11388.4538019873. The cubic root of 129696880 is about 506.1856661631.

The spelling of 129696880 in words is "one hundred twenty-nine million, six hundred ninety-six thousand, eight hundred eighty".