72816439 has 2 divisors, whose sum is σ = 72816440. Its totient is φ = 72816438.

The previous prime is 72816397. The next prime is 72816467. The reversal of 72816439 is 93461827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72816439 - 2¹⁵ = 72783671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72816479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36408219 + 36408220.

It is an arithmetic number, because the mean of its divisors is an integer number (36408220).

Almost surely, 2^72816439 is an apocalyptic number.

72816439 is a deficient number, since it is larger than the sum of its proper divisors (1).

72816439 is an equidigital number, since it uses as much as digits as its factorization.

72816439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 72816439 is about 8533.2548889624. The cubic root of 72816439 is about 417.5833225597.

The spelling of 72816439 in words is "seventy-two million, eight hundred sixteen thousand, four hundred thirty-nine".