64439489 has 2 divisors, whose sum is σ = 64439490. Its totient is φ = 64439488.

The previous prime is 64439477. The next prime is 64439519. The reversal of 64439489 is 98493446.

It is a happy number.

64439489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39589264 + 24850225 = 6292^2 + 4985^2 .

It is a cyclic number.

It is not a de Polignac number, because 64439489 - 2⁸ = 64439233 is a prime.

It is a super-5 number, since 5×64439489⁵ (a number of 40 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (64439429) 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, 32219744 + 32219745.

It is an arithmetic number, because the mean of its divisors is an integer number (32219745).

Almost surely, 2^64439489 is an apocalyptic number.

It is an amenable number.

64439489 is a deficient number, since it is larger than the sum of its proper divisors (1).

64439489 is an equidigital number, since it uses as much as digits as its factorization.

64439489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 47.

The square root of 64439489 is about 8027.4210678150. The cubic root of 64439489 is about 400.9135142245.

The spelling of 64439489 in words is "sixty-four million, four hundred thirty-nine thousand, four hundred eighty-nine".