64644089 has 2 divisors, whose sum is σ = 64644090. Its totient is φ = 64644088.

The previous prime is 64644077. The next prime is 64644091. The reversal of 64644089 is 98044646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54878464 + 9765625 = 7408^2 + 3125^2 .

It is a cyclic number.

It is not a de Polignac number, because 64644089 - 2²⁴ = 47866873 is a prime.

Together with 64644091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64644029) 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, 32322044 + 32322045.

It is an arithmetic number, because the mean of its divisors is an integer number (32322045).

Almost surely, 2^64644089 is an apocalyptic number.

It is an amenable number.

64644089 is a deficient number, since it is larger than the sum of its proper divisors (1).

64644089 is an equidigital number, since it uses as much as digits as its factorization.

64644089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 64644089 is about 8040.1547870672. The cubic root of 64644089 is about 401.3373756658.

The spelling of 64644089 in words is "sixty-four million, six hundred forty-four thousand, eighty-nine".