72320056 has 8 divisors (see below), whose sum is σ = 135600120. Its totient is φ = 36160024.

The previous prime is 72320047. The next prime is 72320107. The reversal of 72320056 is 65002327.

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

It is a self number, because there is not a number n which added to its sum of digits gives 72320056.

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 as a sum of consecutive naturals, namely, 4519996 + ... + 4520011.

It is an arithmetic number, because the mean of its divisors is an integer number (16950015).

Almost surely, 2^72320056 is an apocalyptic number.

It is an amenable number.

72320056 is a deficient number, since it is larger than the sum of its proper divisors (63280064).

72320056 is a wasteful number, since it uses less digits than its factorization.

72320056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9040013 (or 9040009 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 72320056 is about 8504.1199427101. The cubic root of 72320056 is about 416.6322824604.

It can be divided in two parts, 72 and 320056, that multiplied together give a palindrome (23044032).

The spelling of 72320056 in words is "seventy-two million, three hundred twenty thousand, fifty-six".