72973723 has 2 divisors, whose sum is σ = 72973724. Its totient is φ = 72973722.

The previous prime is 72973697. The next prime is 72973763. The reversal of 72973723 is 32737927.

It is an a-pointer prime, because the next prime (72973763) can be obtained adding 72973723 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72973723 is a prime.

It is not a weakly prime, because it can be changed into another prime (72973763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36486861 + 36486862.

It is an arithmetic number, because the mean of its divisors is an integer number (36486862).

Almost surely, 2^72973723 is an apocalyptic number.

72973723 is a deficient number, since it is larger than the sum of its proper divisors (1).

72973723 is an equidigital number, since it uses as much as digits as its factorization.

72973723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111132, while the sum is 40.

The square root of 72973723 is about 8542.4658617989. The cubic root of 72973723 is about 417.8837672748.

The spelling of 72973723 in words is "seventy-two million, nine hundred seventy-three thousand, seven hundred twenty-three".