72168823 has 2 divisors, whose sum is σ = 72168824. Its totient is φ = 72168822.

The previous prime is 72168809. The next prime is 72168857. The reversal of 72168823 is 32886127.

It is a weak prime.

It is an emirp because it is prime and its reverse (32886127) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72168823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72168223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36084411 + 36084412.

It is an arithmetic number, because the mean of its divisors is an integer number (36084412).

Almost surely, 2^72168823 is an apocalyptic number.

72168823 is a deficient number, since it is larger than the sum of its proper divisors (1).

72168823 is an equidigital number, since it uses as much as digits as its factorization.

72168823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 72168823 is about 8495.2235403196. The cubic root of 72168823 is about 416.3416645003.

The spelling of 72168823 in words is "seventy-two million, one hundred sixty-eight thousand, eight hundred twenty-three".