72730439 has 8 divisors (see below), whose sum is σ = 76083840. Its totient is φ = 69393016.

The previous prime is 72730409. The next prime is 72730457. The reversal of 72730439 is 93403727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72730439 - 2⁸ = 72730183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72730399 and 72730408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72730409) by changing a digit.

It is a Zeisel number, with parameters (18, 5).

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5864 + ... + 13410.

It is an arithmetic number, because the mean of its divisors is an integer number (9510480).

Almost surely, 2^72730439 is an apocalyptic number.

72730439 is a deficient number, since it is larger than the sum of its proper divisors (3353401).

72730439 is a wasteful number, since it uses less digits than its factorization.

72730439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7989.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 72730439 is about 8528.2142913977. The cubic root of 72730439 is about 417.4188619261.

The spelling of 72730439 in words is "seventy-two million, seven hundred thirty thousand, four hundred thirty-nine".