72730771 has 4 divisors (see below), whose sum is σ = 72964944. Its totient is φ = 72496600.

The previous prime is 72730751. The next prime is 72730783. The reversal of 72730771 is 17703727.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72730771 - 2⁵ = 72730739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72730751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116620 + ... + 117241.

It is an arithmetic number, because the mean of its divisors is an integer number (18241236).

Almost surely, 2^72730771 is an apocalyptic number.

72730771 is a deficient number, since it is larger than the sum of its proper divisors (234173).

72730771 is a wasteful number, since it uses less digits than its factorization.

72730771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234172.

The product of its (nonzero) digits is 14406, while the sum is 34.

The square root of 72730771 is about 8528.2337561772. The cubic root of 72730771 is about 417.4194970699.

The spelling of 72730771 in words is "seventy-two million, seven hundred thirty thousand, seven hundred seventy-one".