129047580 has 168 divisors, whose sum is σ = 416459232. Its totient is φ = 33561216.

The previous prime is 129047557. The next prime is 129047591. The reversal of 129047580 is 85740921.

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

It is a congruent 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 55 ways as a sum of consecutive naturals, for example, 772657 + ... + 772823.

It is an arithmetic number, because the mean of its divisors is an integer number (2478924).

Almost surely, 2^129047580 is an apocalyptic number.

129047580 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 129047580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208229616).

129047580 is an abundant number, since it is smaller than the sum of its proper divisors (287411652).

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

129047580 is a wasteful number, since it uses less digits than its factorization.

129047580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 129047580 is about 11359.9110912014. The cubic root of 129047580 is about 505.3395487911.

The spelling of 129047580 in words is "one hundred twenty-nine million, forty-seven thousand, five hundred eighty".