64808647 has 2 divisors, whose sum is σ = 64808648. Its totient is φ = 64808646.

The previous prime is 64808633. The next prime is 64808651. The reversal of 64808647 is 74680846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64808647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64808617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32404323 + 32404324.

It is an arithmetic number, because the mean of its divisors is an integer number (32404324).

Almost surely, 2^64808647 is an apocalyptic number.

64808647 is a deficient number, since it is larger than the sum of its proper divisors (1).

64808647 is an equidigital number, since it uses as much as digits as its factorization.

64808647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 64808647 is about 8050.3817921885. The cubic root of 64808647 is about 401.6776352631.

The spelling of 64808647 in words is "sixty-four million, eight hundred eight thousand, six hundred forty-seven".