64644287 has 2 divisors, whose sum is σ = 64644288. Its totient is φ = 64644286.

The previous prime is 64644263. The next prime is 64644299. The reversal of 64644287 is 78244646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64644287 - 2⁸ = 64644031 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64644227) 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, 32322143 + 32322144.

It is an arithmetic number, because the mean of its divisors is an integer number (32322144).

Almost surely, 2^64644287 is an apocalyptic number.

64644287 is a deficient number, since it is larger than the sum of its proper divisors (1).

64644287 is an equidigital number, since it uses as much as digits as its factorization.

64644287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 41.

The square root of 64644287 is about 8040.1671002536. The cubic root of 64644287 is about 401.3377854208.

The spelling of 64644287 in words is "sixty-four million, six hundred forty-four thousand, two hundred eighty-seven".