72807439 has 2 divisors, whose sum is σ = 72807440. Its totient is φ = 72807438.

The previous prime is 72807433. The next prime is 72807451. The reversal of 72807439 is 93470827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72807439 - 2⁵ = 72807407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72807433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36403719 + 36403720.

It is an arithmetic number, because the mean of its divisors is an integer number (36403720).

Almost surely, 2^72807439 is an apocalyptic number.

72807439 is a deficient number, since it is larger than the sum of its proper divisors (1).

72807439 is an equidigital number, since it uses as much as digits as its factorization.

72807439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 72807439 is about 8532.7275240687. The cubic root of 72807439 is about 417.5661176318.

The spelling of 72807439 in words is "seventy-two million, eight hundred seven thousand, four hundred thirty-nine".