129328326 has 40 divisors (see below), whose sum is σ = 305050680. Its totient is φ = 40839552.

The previous prime is 129328273. The next prime is 129328327. The reversal of 129328326 is 623823921.

129328326 is a `hidden beast` number, since 1 + 2 + 9 + 328 + 326 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129328327) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17931 + ... + 24086.

It is an arithmetic number, because the mean of its divisors is an integer number (7626267).

Almost surely, 2^129328326 is an apocalyptic number.

129328326 is an abundant number, since it is smaller than the sum of its proper divisors (175722354).

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

129328326 is a wasteful number, since it uses less digits than its factorization.

129328326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42050 (or 42041 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 129328326 is about 11372.2612527149. The cubic root of 129328326 is about 505.7057426636.

It can be divided in two parts, 129 and 328326, that added together give a triangular number (328455 = T₈₁₀).

The spelling of 129328326 in words is "one hundred twenty-nine million, three hundred twenty-eight thousand, three hundred twenty-six".