43664825 has 12 divisors (see below), whose sum is σ = 54683628. Its totient is φ = 34584000.

The previous prime is 43664813. The next prime is 43664827. The reversal of 43664825 is 52846634.

43664825 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 6 ways, for example, as 840889 + 42823936 = 917^2 + 6544^2 .

It is not a de Polignac number, because 43664825 - 2⁴ = 43664809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43664827) 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 in 11 ways as a sum of consecutive naturals, for example, 6122 + ... + 11171.

It is an arithmetic number, because the mean of its divisors is an integer number (4556969).

Almost surely, 2^43664825 is an apocalyptic number.

It is an amenable number.

43664825 is a deficient number, since it is larger than the sum of its proper divisors (11018803).

43664825 is a wasteful number, since it uses less digits than its factorization.

43664825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17404 (or 17399 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 43664825 is about 6607.9365160389. The cubic root of 43664825 is about 352.1361199833.

The spelling of 43664825 in words is "forty-three million, six hundred sixty-four thousand, eight hundred twenty-five".