129722880 has 320 divisors, whose sum is σ = 502824960. Its totient is φ = 27869184.

The previous prime is 129722843. The next prime is 129722897. The reversal of 129722880 is 88227921.

It is a tau number, because it is divible by the number of its divisors (320).

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 31 ways as a sum of consecutive naturals, for example, 1021377 + ... + 1021503.

It is an arithmetic number, because the mean of its divisors is an integer number (1571328).

Almost surely, 2^129722880 is an apocalyptic number.

129722880 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 129722880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251412480).

129722880 is an abundant number, since it is smaller than the sum of its proper divisors (373102080).

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

129722880 is a wasteful number, since it uses less digits than its factorization.

129722880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 129722880 is about 11389.5952518077. The cubic root of 129722880 is about 506.2194884827.

The spelling of 129722880 in words is "one hundred twenty-nine million, seven hundred twenty-two thousand, eight hundred eighty".