72317723 has 4 divisors (see below), whose sum is σ = 73397160. Its totient is φ = 71238288.

The previous prime is 72317719. The next prime is 72317731. The reversal of 72317723 is 32771327.

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 72317723 - 2² = 72317719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72317723.

It is not an unprimeable number, because it can be changed into a prime (72317753) 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, 539618 + ... + 539751.

It is an arithmetic number, because the mean of its divisors is an integer number (18349290).

Almost surely, 2^72317723 is an apocalyptic number.

72317723 is a deficient number, since it is larger than the sum of its proper divisors (1079437).

72317723 is a wasteful number, since it uses less digits than its factorization.

72317723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079436.

The product of its digits is 12348, while the sum is 32.

The square root of 72317723 is about 8503.9827727953. The cubic root of 72317723 is about 416.6278023128.

The spelling of 72317723 in words is "seventy-two million, three hundred seventeen thousand, seven hundred twenty-three".