129621187680 has 96 divisors (see below), whose sum is σ = 408805312608. Its totient is φ = 34523443200.

The previous prime is 129621187679. The next prime is 129621187721. The reversal of 129621187680 is 86781126921.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229620 + ... + 558540.

It is an arithmetic number, because the mean of its divisors is an integer number (4258388673).

Almost surely, 2^129621187680 is an apocalyptic number.

129621187680 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 129621187680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204402656304).

129621187680 is an abundant number, since it is smaller than the sum of its proper divisors (279184124928).

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

129621187680 is a wasteful number, since it uses less digits than its factorization.

129621187680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329760 (or 329752 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 129621187680 in words is "one hundred twenty-nine billion, six hundred twenty-one million, one hundred eighty-seven thousand, six hundred eighty".