72304440 has 64 divisors (see below), whose sum is σ = 233604000. Its totient is φ = 17797632.

The previous prime is 72304439. The next prime is 72304469. The reversal of 72304440 is 4440327.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 72304440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21615 + ... + 24734.

Almost surely, 2^72304440 is an apocalyptic number.

It is an amenable number.

72304440 is an abundant number, since it is smaller than the sum of its proper divisors (161299560).

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

72304440 is a wasteful number, since it uses less digits than its factorization.

72304440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46376 (or 46372 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 72304440 is about 8503.2017499293. The cubic root of 72304440 is about 416.6022926327.

Adding to 72304440 its reverse (4440327), we get a palindrome (76744767).

The spelling of 72304440 in words is "seventy-two million, three hundred four thousand, four hundred forty".