6464639 has 2 divisors, whose sum is σ = 6464640. Its totient is φ = 6464638.

The previous prime is 6464611. The next prime is 6464687. The reversal of 6464639 is 9364646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6464639 - 2¹² = 6460543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6464609) 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, 3232319 + 3232320.

It is an arithmetic number, because the mean of its divisors is an integer number (3232320).

Almost surely, 2^6464639 is an apocalyptic number.

6464639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6464639 is an equidigital number, since it uses as much as digits as its factorization.

6464639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 38.

The square root of 6464639 is about 2542.5654367194. The cubic root of 6464639 is about 186.2865183712.

The spelling of 6464639 in words is "six million, four hundred sixty-four thousand, six hundred thirty-nine".