72129320 has 32 divisors (see below), whose sum is σ = 170834400. Its totient is φ = 27332928.

The previous prime is 72129289. The next prime is 72129331. The reversal of 72129320 is 2392127.

It is a self number, because there is not a number n which added to its sum of digits gives 72129320.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46694 + ... + 48213.

It is an arithmetic number, because the mean of its divisors is an integer number (5338575).

Almost surely, 2^72129320 is an apocalyptic number.

It is an amenable number.

72129320 is an abundant number, since it is smaller than the sum of its proper divisors (98705080).

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

72129320 is a wasteful number, since it uses less digits than its factorization.

72129320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94937 (or 94933 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 72129320 is about 8492.8982096808. The cubic root of 72129320 is about 416.2656864172.

The spelling of 72129320 in words is "seventy-two million, one hundred twenty-nine thousand, three hundred twenty".