64440671 has 2 divisors, whose sum is σ = 64440672. Its totient is φ = 64440670.

The previous prime is 64440653. The next prime is 64440679. The reversal of 64440671 is 17604446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64440671 - 2¹⁴ = 64424287 is a prime.

It is a Sophie Germain 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 (64440679) 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, 32220335 + 32220336.

It is an arithmetic number, because the mean of its divisors is an integer number (32220336).

Almost surely, 2^64440671 is an apocalyptic number.

64440671 is a deficient number, since it is larger than the sum of its proper divisors (1).

64440671 is an equidigital number, since it uses as much as digits as its factorization.

64440671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 64440671 is about 8027.4946901259. The cubic root of 64440671 is about 400.9159655003.

The spelling of 64440671 in words is "sixty-four million, four hundred forty thousand, six hundred seventy-one".