72730645 has 16 divisors (see below), whose sum is σ = 94453632. Its totient is φ = 53444160.

The previous prime is 72730633. The next prime is 72730661. The reversal of 72730645 is 54603727.

It is a happy number.

It is not a de Polignac number, because 72730645 - 2⁷ = 72730517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72730645.

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 15 ways as a sum of consecutive naturals, for example, 11064 + ... + 16366.

It is an arithmetic number, because the mean of its divisors is an integer number (5903352).

Almost surely, 2^72730645 is an apocalyptic number.

It is an amenable number.

72730645 is a deficient number, since it is larger than the sum of its proper divisors (21722987).

72730645 is a wasteful number, since it uses less digits than its factorization.

72730645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 72730645 is about 8528.2263689468. The cubic root of 72730645 is about 417.4192560216.

The spelling of 72730645 in words is "seventy-two million, seven hundred thirty thousand, six hundred forty-five".