64520647 has 2 divisors, whose sum is σ = 64520648. Its totient is φ = 64520646.

The previous prime is 64520633. The next prime is 64520669. The reversal of 64520647 is 74602546.

64520647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64520647 - 2¹¹ = 64518599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64520747) 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, 32260323 + 32260324.

It is an arithmetic number, because the mean of its divisors is an integer number (32260324).

Almost surely, 2^64520647 is an apocalyptic number.

64520647 is a deficient number, since it is larger than the sum of its proper divisors (1).

64520647 is an equidigital number, since it uses as much as digits as its factorization.

64520647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 64520647 is about 8032.4745253253. The cubic root of 64520647 is about 401.0817531382.

The spelling of 64520647 in words is "sixty-four million, five hundred twenty thousand, six hundred forty-seven".