129628956289 has 8 divisors (see below), whose sum is σ = 148489523840. Its totient is φ = 110853925056.

The previous prime is 129628956287. The next prime is 129628956307. The reversal of 129628956289 is 982659826921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129628956289 - 2¹ = 129628956287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129628956287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21380829 + ... + 21386890.

It is an arithmetic number, because the mean of its divisors is an integer number (18561190480).

Almost surely, 2^129628956289 is an apocalyptic number.

It is an amenable number.

129628956289 is a deficient number, since it is larger than the sum of its proper divisors (18860567551).

129628956289 is an equidigital number, since it uses as much as digits as its factorization.

129628956289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42768159.

The product of its digits is 67184640, while the sum is 67.

The spelling of 129628956289 in words is "one hundred twenty-nine billion, six hundred twenty-eight million, nine hundred fifty-six thousand, two hundred eighty-nine".