129987128572170 has 256 divisors, whose sum is σ = 321532726874112. Its totient is φ = 33619885608960.

The previous prime is 129987128572123. The next prime is 129987128572183. The reversal of 129987128572170 is 71275821789921.

It is a junction number, because it is equal to n+sod(n) for n = 129987128572095 and 129987128572104.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 51932531139 + ... + 51932533641.

It is an arithmetic number, because the mean of its divisors is an integer number (1255987214352).

Almost surely, 2^{129987128572170} is an apocalyptic number.

129987128572170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129987128572170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160766363437056).

129987128572170 is an abundant number, since it is smaller than the sum of its proper divisors (191545598301942).

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

129987128572170 is a wasteful number, since it uses less digits than its factorization.

129987128572170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805.

The product of its (nonzero) digits is 71124480, while the sum is 69.

The spelling of 129987128572170 in words is "one hundred twenty-nine trillion, nine hundred eighty-seven billion, one hundred twenty-eight million, five hundred seventy-two thousand, one hundred seventy".