72320723 has 2 divisors, whose sum is σ = 72320724. Its totient is φ = 72320722.

The previous prime is 72320713. The next prime is 72320753. The reversal of 72320723 is 32702327.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72320723 - 2⁶ = 72320659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72320692 and 72320701.

It is not a weakly prime, because it can be changed into another prime (72320713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36160361 + 36160362.

It is an arithmetic number, because the mean of its divisors is an integer number (36160362).

Almost surely, 2^72320723 is an apocalyptic number.

72320723 is a deficient number, since it is larger than the sum of its proper divisors (1).

72320723 is an equidigital number, since it uses as much as digits as its factorization.

72320723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 26.

The square root of 72320723 is about 8504.1591589057. The cubic root of 72320723 is about 416.6335633078.

The spelling of 72320723 in words is "seventy-two million, three hundred twenty thousand, seven hundred twenty-three".