72912328 has 8 divisors (see below), whose sum is σ = 136710630. Its totient is φ = 36456160.

The previous prime is 72912319. The next prime is 72912331. The reversal of 72912328 is 82321927.

It can be written as a sum of positive squares in only one way, i.e., 72897444 + 14884 = 8538^2 + 122^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 72912293 and 72912302.

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 as a sum of consecutive naturals, namely, 4557013 + ... + 4557028.

Almost surely, 2^72912328 is an apocalyptic number.

It is an amenable number.

72912328 is a deficient number, since it is larger than the sum of its proper divisors (63798302).

72912328 is a wasteful number, since it uses less digits than its factorization.

72912328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9114047 (or 9114043 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 72912328 is about 8538.8715882135. The cubic root of 72912328 is about 417.7665416432.

The spelling of 72912328 in words is "seventy-two million, nine hundred twelve thousand, three hundred twenty-eight".