129872328 has 16 divisors (see below), whose sum is σ = 324680880. Its totient is φ = 43290768.

The previous prime is 129872317. The next prime is 129872339. The reversal of 129872328 is 823278921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129872317) and next prime (129872339).

It is a self number, because there is not a number n which added to its sum of digits gives 129872328.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2705650 + ... + 2705697.

It is an arithmetic number, because the mean of its divisors is an integer number (20292555).

Almost surely, 2^129872328 is an apocalyptic number.

It is an amenable number.

129872328 is an abundant number, since it is smaller than the sum of its proper divisors (194808552).

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

129872328 is a wasteful number, since it uses less digits than its factorization.

129872328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5411356 (or 5411352 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 129872328 is about 11396.1540881124. The cubic root of 129872328 is about 506.4138115822.

The spelling of 129872328 in words is "one hundred twenty-nine million, eight hundred seventy-two thousand, three hundred twenty-eight".