72957223 has 2 divisors, whose sum is σ = 72957224. Its totient is φ = 72957222.

The previous prime is 72957221. The next prime is 72957239. The reversal of 72957223 is 32275927.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72957223 - 2¹ = 72957221 is a prime.

Together with 72957221, it forms a pair of twin primes.

It is the 8542-nd Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72957221) by changing a digit.

It is a nontrivial repunit in base 8541.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36478611 + 36478612.

It is an arithmetic number, because the mean of its divisors is an integer number (36478612).

Almost surely, 2^72957223 is an apocalyptic number.

72957223 is a deficient number, since it is larger than the sum of its proper divisors (1).

72957223 is an equidigital number, since it uses as much as digits as its factorization.

72957223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 37.

The square root of 72957223 is about 8541.5000439033. The cubic root of 72957223 is about 417.8522691701.

The spelling of 72957223 in words is "seventy-two million, nine hundred fifty-seven thousand, two hundred twenty-three".