129798256 has 30 divisors (see below), whose sum is σ = 292544520. Its totient is φ = 55627488.

The previous prime is 129798203. The next prime is 129798259. The reversal of 129798256 is 652897921.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129798259) 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 5 ways as a sum of consecutive naturals, for example, 81996 + ... + 83563.

It is an arithmetic number, because the mean of its divisors is an integer number (9751484).

Almost surely, 2^129798256 is an apocalyptic number.

129798256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129798256 is an abundant number, since it is smaller than the sum of its proper divisors (162746264).

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

129798256 is a wasteful number, since it uses less digits than its factorization.

129798256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165581 (or 165568 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

The square root of 129798256 is about 11392.9037562862. The cubic root of 129798256 is about 506.3175164537.

The spelling of 129798256 in words is "one hundred twenty-nine million, seven hundred ninety-eight thousand, two hundred fifty-six".