72445320 has 64 divisors (see below), whose sum is σ = 241488000. Its totient is φ = 19318464.

The previous prime is 72445301. The next prime is 72445337. The reversal of 72445320 is 2354427.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 15 ways as a sum of consecutive naturals, for example, 32460 + ... + 34619.

It is an arithmetic number, because the mean of its divisors is an integer number (3773250).

Almost surely, 2^72445320 is an apocalyptic number.

It is an amenable number.

72445320 is an abundant number, since it is smaller than the sum of its proper divisors (169042680).

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

72445320 is a wasteful number, since it uses less digits than its factorization.

72445320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67099 (or 67089 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 72445320 is about 8511.4816571499. The cubic root of 72445320 is about 416.8726902912.

Adding to 72445320 its reverse (2354427), we get a palindrome (74799747).

The spelling of 72445320 in words is "seventy-two million, four hundred forty-five thousand, three hundred twenty".