129720880520 has 64 divisors (see below), whose sum is σ = 363892348800. Its totient is φ = 40432481280.

The previous prime is 129720880447. The next prime is 129720880537. The reversal of 129720880520 is 25088027921.

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 21055505 + ... + 21061664.

It is an arithmetic number, because the mean of its divisors is an integer number (5685817950).

Almost surely, 2^129720880520 is an apocalyptic number.

129720880520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129720880520 is an abundant number, since it is smaller than the sum of its proper divisors (234171468280).

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

129720880520 is a wasteful number, since it uses less digits than its factorization.

129720880520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42117198 (or 42117194 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 129720880520 in words is "one hundred twenty-nine billion, seven hundred twenty million, eight hundred eighty thousand, five hundred twenty".