72309713 has 4 divisors (see below), whose sum is σ = 82639680. Its totient is φ = 61979748.

The previous prime is 72309709. The next prime is 72309719. The reversal of 72309713 is 31790327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72309713 - 2² = 72309709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72309713.

It is not an unprimeable number, because it can be changed into a prime (72309719) 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, 5164973 + ... + 5164986.

It is an arithmetic number, because the mean of its divisors is an integer number (20659920).

Almost surely, 2^72309713 is an apocalyptic number.

It is an amenable number.

72309713 is a deficient number, since it is larger than the sum of its proper divisors (10329967).

72309713 is a wasteful number, since it uses less digits than its factorization.

72309713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10329966.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 72309713 is about 8503.5118039549. The cubic root of 72309713 is about 416.6124196755.

The spelling of 72309713 in words is "seventy-two million, three hundred nine thousand, seven hundred thirteen".