72807391 has 2 divisors, whose sum is σ = 72807392. Its totient is φ = 72807390.

The previous prime is 72807389. The next prime is 72807403. The reversal of 72807391 is 19370827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72807391 - 2¹ = 72807389 is a prime.

Together with 72807389, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72807391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72807331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36403695 + 36403696.

It is an arithmetic number, because the mean of its divisors is an integer number (36403696).

Almost surely, 2^72807391 is an apocalyptic number.

72807391 is a deficient number, since it is larger than the sum of its proper divisors (1).

72807391 is an equidigital number, since it uses as much as digits as its factorization.

72807391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 72807391 is about 8532.7247113686. The cubic root of 72807391 is about 417.5660258683.

The spelling of 72807391 in words is "seventy-two million, eight hundred seven thousand, three hundred ninety-one".