129991680 has 528 divisors, whose sum is σ = 572242944. Its totient is φ = 26542080.

The previous prime is 129991663. The next prime is 129991703. The reversal of 129991680 is 86199921.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4193265 + ... + 4193295.

Almost surely, 2^129991680 is an apocalyptic number.

129991680 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 129991680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286121472).

129991680 is an abundant number, since it is smaller than the sum of its proper divisors (442251264).

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

129991680 is a wasteful number, since it uses less digits than its factorization.

129991680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 129991680 is about 11401.3893890175. The cubic root of 129991680 is about 506.5688946459.

The spelling of 129991680 in words is "one hundred twenty-nine million, nine hundred ninety-one thousand, six hundred eighty".