129056656 has 40 divisors (see below), whose sum is σ = 265529880. Its totient is φ = 60555264.

The previous prime is 129056647. The next prime is 129056677. The reversal of 129056656 is 656650921.

It can be written as a sum of positive squares in 4 ways, for example, as 4064256 + 124992400 = 2016^2 + 11180^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167440 + ... + 168208.

It is an arithmetic number, because the mean of its divisors is an integer number (6638247).

Almost surely, 2^129056656 is an apocalyptic number.

129056656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129056656 is an abundant number, since it is smaller than the sum of its proper divisors (136473224).

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

129056656 is a wasteful number, since it uses less digits than its factorization.

129056656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411 (or 1405 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 129056656 is about 11360.3105591353. The cubic root of 129056656 is about 505.3513954662.

The spelling of 129056656 in words is "one hundred twenty-nine million, fifty-six thousand, six hundred fifty-six".