72009328 has 20 divisors (see below), whose sum is σ = 139661200. Its totient is φ = 35967744.

The previous prime is 72009319. The next prime is 72009359. The reversal of 72009328 is 82390027.

It is a self number, because there is not a number n which added to its sum of digits gives 72009328.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 20776 + ... + 23992.

It is an arithmetic number, because the mean of its divisors is an integer number (6983060).

Almost surely, 2^72009328 is an apocalyptic number.

It is an amenable number.

72009328 is a deficient number, since it is larger than the sum of its proper divisors (67651872).

72009328 is a wasteful number, since it uses less digits than its factorization.

72009328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624 (or 4618 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 72009328 is about 8485.8310141082. The cubic root of 72009328 is about 416.0347295956.

The spelling of 72009328 in words is "seventy-two million, nine thousand, three hundred twenty-eight".