129207056 has 20 divisors (see below), whose sum is σ = 273097104. Its totient is φ = 58730400.

The previous prime is 129207053. The next prime is 129207073. The reversal of 129207056 is 650702921.

It is not an unprimeable number, because it can be changed into a prime (129207053) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 366890 + ... + 367241.

Almost surely, 2^129207056 is an apocalyptic number.

129207056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129207056 is an abundant number, since it is smaller than the sum of its proper divisors (143890048).

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

129207056 is a wasteful number, since it uses less digits than its factorization.

129207056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734150 (or 734144 counting only the distinct ones).

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

The square root of 129207056 is about 11366.9281690349. The cubic root of 129207056 is about 505.5476280008.

Adding to 129207056 its reverse (650702921), we get a palindrome (779909977).

The spelling of 129207056 in words is "one hundred twenty-nine million, two hundred seven thousand, fifty-six".