72997823 has 2 divisors, whose sum is σ = 72997824. Its totient is φ = 72997822.

The previous prime is 72997819. The next prime is 72997849. The reversal of 72997823 is 32879927.

It is a weak prime.

It is an emirp because it is prime and its reverse (32879927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72997823 - 2² = 72997819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72997853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36498911 + 36498912.

It is an arithmetic number, because the mean of its divisors is an integer number (36498912).

Almost surely, 2^72997823 is an apocalyptic number.

72997823 is a deficient number, since it is larger than the sum of its proper divisors (1).

72997823 is an equidigital number, since it uses as much as digits as its factorization.

72997823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 72997823 is about 8543.8763450790. The cubic root of 72997823 is about 417.9297650665.

The spelling of 72997823 in words is "seventy-two million, nine hundred ninety-seven thousand, eight hundred twenty-three".