129296928 has 24 divisors (see below), whose sum is σ = 339404688. Its totient is φ = 43098944.

The previous prime is 129296927. The next prime is 129296929. The reversal of 129296928 is 829692921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129296927) and next prime (129296929).

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (129296927) 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, 673326 + ... + 673517.

It is an arithmetic number, because the mean of its divisors is an integer number (14141862).

Almost surely, 2^129296928 is an apocalyptic number.

It is an amenable number.

129296928 is an abundant number, since it is smaller than the sum of its proper divisors (210107760).

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

129296928 is a wasteful number, since it uses less digits than its factorization.

129296928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346856 (or 1346848 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The square root of 129296928 is about 11370.8807046772. The cubic root of 129296928 is about 505.6648147026.

The spelling of 129296928 in words is "one hundred twenty-nine million, two hundred ninety-six thousand, nine hundred twenty-eight".