72687947 has 2 divisors, whose sum is σ = 72687948. Its totient is φ = 72687946.

The previous prime is 72687929. The next prime is 72687959. The reversal of 72687947 is 74978627.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72687947 - 2⁸ = 72687691 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72687895 and 72687904.

It is not a weakly prime, because it can be changed into another prime (72687907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36343973 + 36343974.

It is an arithmetic number, because the mean of its divisors is an integer number (36343974).

Almost surely, 2^72687947 is an apocalyptic number.

72687947 is a deficient number, since it is larger than the sum of its proper divisors (1).

72687947 is an equidigital number, since it uses as much as digits as its factorization.

72687947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 50.

The square root of 72687947 is about 8525.7226673168. The cubic root of 72687947 is about 417.3375552185.

The spelling of 72687947 in words is "seventy-two million, six hundred eighty-seven thousand, nine hundred forty-seven".