72639344 has 20 divisors (see below), whose sum is σ = 142033320. Its totient is φ = 35985600.

The previous prime is 72639311. The next prime is 72639361. The reversal of 72639344 is 44393627.

It is a junction number, because it is equal to n+sod(n) for n = 72639298 and 72639307.

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, 19082 + ... + 22569.

It is an arithmetic number, because the mean of its divisors is an integer number (7101666).

Almost surely, 2^72639344 is an apocalyptic number.

It is an amenable number.

72639344 is a deficient number, since it is larger than the sum of its proper divisors (69393976).

72639344 is a wasteful number, since it uses less digits than its factorization.

72639344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41768 (or 41762 counting only the distinct ones).

The product of its digits is 108864, while the sum is 38.

The square root of 72639344 is about 8522.8718164713. The cubic root of 72639344 is about 417.2445165023.

The spelling of 72639344 in words is "seventy-two million, six hundred thirty-nine thousand, three hundred forty-four".