64439825 has 6 divisors (see below), whose sum is σ = 79905414. Its totient is φ = 51551840.

The previous prime is 64439803. The next prime is 64439839. The reversal of 64439825 is 52893446.

64439825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 6436369 + 58003456 = 2537^2 + 7616^2 .

It is not a de Polignac number, because 64439825 - 2⁶ = 64439761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 1288772 + ... + 1288821.

It is an arithmetic number, because the mean of its divisors is an integer number (13317569).

Almost surely, 2^64439825 is an apocalyptic number.

It is an amenable number.

64439825 is a deficient number, since it is larger than the sum of its proper divisors (15465589).

64439825 is a wasteful number, since it uses less digits than its factorization.

64439825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577603 (or 2577598 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 64439825 is about 8027.4419960533. The cubic root of 64439825 is about 400.9142110369.

The spelling of 64439825 in words is "sixty-four million, four hundred thirty-nine thousand, eight hundred twenty-five".