72247687 has 2 divisors, whose sum is σ = 72247688. Its totient is φ = 72247686.

The previous prime is 72247667. The next prime is 72247691. The reversal of 72247687 is 78674227.

It is a strong prime.

It is an emirp because it is prime and its reverse (78674227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72247687 - 2⁷ = 72247559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72247627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36123843 + 36123844.

It is an arithmetic number, because the mean of its divisors is an integer number (36123844).

Almost surely, 2^72247687 is an apocalyptic number.

72247687 is a deficient number, since it is larger than the sum of its proper divisors (1).

72247687 is an equidigital number, since it uses as much as digits as its factorization.

72247687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 263424, while the sum is 43.

The square root of 72247687 is about 8499.8639400875. The cubic root of 72247687 is about 416.4932646640.

The spelling of 72247687 in words is "seventy-two million, two hundred forty-seven thousand, six hundred eighty-seven".