129065720 has 32 divisors (see below), whose sum is σ = 331884000. Its totient is φ = 44251008.

The previous prime is 129065711. The next prime is 129065723. The reversal of 129065720 is 27560921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129065723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230195 + ... + 230754.

It is an arithmetic number, because the mean of its divisors is an integer number (10371375).

Almost surely, 2^129065720 is an apocalyptic number.

129065720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129065720 is an abundant number, since it is smaller than the sum of its proper divisors (202818280).

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

129065720 is a wasteful number, since it uses less digits than its factorization.

129065720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460967 (or 460963 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 129065720 is about 11360.7094848869. The cubic root of 129065720 is about 505.3632259236.

The spelling of 129065720 in words is "one hundred twenty-nine million, sixty-five thousand, seven hundred twenty".