64442239 has 2 divisors, whose sum is σ = 64442240. Its totient is φ = 64442238.

The previous prime is 64442237. The next prime is 64442267. The reversal of 64442239 is 93224446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64442239 - 2¹ = 64442237 is a prime.

Together with 64442237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64442237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32221119 + 32221120.

It is an arithmetic number, because the mean of its divisors is an integer number (32221120).

Almost surely, 2^64442239 is an apocalyptic number.

64442239 is a deficient number, since it is larger than the sum of its proper divisors (1).

64442239 is an equidigital number, since it uses as much as digits as its factorization.

64442239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 34.

The square root of 64442239 is about 8027.5923538755. The cubic root of 64442239 is about 400.9192172311.

The spelling of 64442239 in words is "sixty-four million, four hundred forty-two thousand, two hundred thirty-nine".