64439289 has 6 divisors (see below), whose sum is σ = 93078986. Its totient is φ = 42959520.

The previous prime is 64439239. The next prime is 64439321. The reversal of 64439289 is 98293446.

It can be written as a sum of positive squares in only one way, i.e., 49112064 + 15327225 = 7008^2 + 3915^2 .

It is not a de Polignac number, because 64439289 - 2⁷ = 64439161 is a prime.

It is a super-5 number, since 5×64439289⁵ (a number of 40 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64439239) 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 in 5 ways as a sum of consecutive naturals, for example, 3579952 + ... + 3579969.

Almost surely, 2^64439289 is an apocalyptic number.

It is an amenable number.

64439289 is a deficient number, since it is larger than the sum of its proper divisors (28639697).

64439289 is a wasteful number, since it uses less digits than its factorization.

64439289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7159927 (or 7159924 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 64439289 is about 8027.4086105044. The cubic root of 64439289 is about 400.9130994541.

The spelling of 64439289 in words is "sixty-four million, four hundred thirty-nine thousand, two hundred eighty-nine".