129810056 has 24 divisors (see below), whose sum is σ = 246505770. Its totient is φ = 64078848.

The previous prime is 129810053. The next prime is 129810067. The reversal of 129810056 is 650018921.

It can be written as a sum of positive squares in 3 ways, for example, as 129185956 + 624100 = 11366^2 + 790^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129810053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 317180 + ... + 317588.

Almost surely, 2^129810056 is an apocalyptic number.

It is an amenable number.

129810056 is a deficient number, since it is larger than the sum of its proper divisors (116695714).

129810056 is an frugal number, since it uses more digits than its factorization.

129810056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 129810056 is about 11393.4216107366. The cubic root of 129810056 is about 506.3328591500.

Adding to 129810056 its reverse (650018921), we get a palindrome (779828977).

The spelling of 129810056 in words is "one hundred twenty-nine million, eight hundred ten thousand, fifty-six".