129315228 has 24 divisors (see below), whose sum is σ = 344840832. Its totient is φ = 36947184.

The previous prime is 129315227. The next prime is 129315239. The reversal of 129315228 is 822513921.

It is a happy number.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129315227) 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, 769650 + ... + 769817.

It is an arithmetic number, because the mean of its divisors is an integer number (14368368).

Almost surely, 2^129315228 is an apocalyptic number.

It is an amenable number.

129315228 is an abundant number, since it is smaller than the sum of its proper divisors (215525604).

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

129315228 is a wasteful number, since it uses less digits than its factorization.

129315228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539481 (or 1539479 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 129315228 is about 11371.6853632168. The cubic root of 129315228 is about 505.6886699473.

The spelling of 129315228 in words is "one hundred twenty-nine million, three hundred fifteen thousand, two hundred twenty-eight".