72845831 has 2 divisors, whose sum is σ = 72845832. Its totient is φ = 72845830.

The previous prime is 72845813. The next prime is 72845893. The reversal of 72845831 is 13854827.

Together with previous prime (72845813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72845831 is a prime.

It is a super-2 number, since 2×72845831² = 10613030188161122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72845131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36422915 + 36422916.

It is an arithmetic number, because the mean of its divisors is an integer number (36422916).

Almost surely, 2^72845831 is an apocalyptic number.

72845831 is a deficient number, since it is larger than the sum of its proper divisors (1).

72845831 is an equidigital number, since it uses as much as digits as its factorization.

72845831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 72845831 is about 8534.9769185394. The cubic root of 72845831 is about 417.6395001580.

The spelling of 72845831 in words is "seventy-two million, eight hundred forty-five thousand, eight hundred thirty-one".