72730665 has 24 divisors (see below), whose sum is σ = 144076608. Its totient is φ = 33248160.

The previous prime is 72730663. The next prime is 72730739. The reversal of 72730665 is 56603727.

It is a happy number.

It is not a de Polignac number, because 72730665 - 2¹ = 72730663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72730661) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 115131 + ... + 115760.

It is an arithmetic number, because the mean of its divisors is an integer number (6003192).

Almost surely, 2^72730665 is an apocalyptic number.

It is an amenable number.

72730665 is a deficient number, since it is larger than the sum of its proper divisors (71345943).

72730665 is a wasteful number, since it uses less digits than its factorization.

72730665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230909 (or 230906 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 72730665 is about 8528.2275415235. The cubic root of 72730665 is about 417.4192942832.

The spelling of 72730665 in words is "seventy-two million, seven hundred thirty thousand, six hundred sixty-five".