72730243 has 4 divisors (see below), whose sum is σ = 74421688. Its totient is φ = 71038800.

The previous prime is 72730237. The next prime is 72730249. The reversal of 72730243 is 34203727.

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

It is an interprime number because it is at equal distance from previous prime (72730237) and next prime (72730249).

It is a cyclic number.

It is not a de Polignac number, because 72730243 - 2⁵ = 72730211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72730249) 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, 845658 + ... + 845743.

It is an arithmetic number, because the mean of its divisors is an integer number (18605422).

Almost surely, 2^72730243 is an apocalyptic number.

72730243 is a deficient number, since it is larger than the sum of its proper divisors (1691445).

72730243 is a wasteful number, since it uses less digits than its factorization.

72730243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691444.

The product of its (nonzero) digits is 7056, while the sum is 28.

The square root of 72730243 is about 8528.2028001215. The cubic root of 72730243 is about 417.4184869609.

The spelling of 72730243 in words is "seventy-two million, seven hundred thirty thousand, two hundred forty-three".