64445939 has 2 divisors, whose sum is σ = 64445940. Its totient is φ = 64445938.

The previous prime is 64445921. The next prime is 64445987. The reversal of 64445939 is 93954446.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64445939 - 2¹² = 64441843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64445939.

It is not a weakly prime, because it can be changed into another prime (64445999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32222969 + 32222970.

It is an arithmetic number, because the mean of its divisors is an integer number (32222970).

Almost surely, 2^64445939 is an apocalyptic number.

64445939 is a deficient number, since it is larger than the sum of its proper divisors (1).

64445939 is an equidigital number, since it uses as much as digits as its factorization.

64445939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 44.

The square root of 64445939 is about 8027.8228057176. The cubic root of 64445939 is about 400.9268901111.

The spelling of 64445939 in words is "sixty-four million, four hundred forty-five thousand, nine hundred thirty-nine".