129052640 has 24 divisors (see below), whose sum is σ = 304887240. Its totient is φ = 51620992.

The previous prime is 129052607. The next prime is 129052643. The reversal of 129052640 is 46250921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129052643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403130 + ... + 403449.

It is an arithmetic number, because the mean of its divisors is an integer number (12703635).

Almost surely, 2^129052640 is an apocalyptic number.

129052640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129052640 is an abundant number, since it is smaller than the sum of its proper divisors (175834600).

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

129052640 is an equidigital number, since it uses as much as digits as its factorization.

129052640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806594 (or 806586 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 129052640 is about 11360.1338020289. The cubic root of 129052640 is about 505.3461535507.

The spelling of 129052640 in words is "one hundred twenty-nine million, fifty-two thousand, six hundred forty".