43664109 has 16 divisors (see below), whose sum is σ = 64889280. Its totient is φ = 25954560.

The previous prime is 43664099. The next prime is 43664113. The reversal of 43664109 is 90146634.

43664109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43664109 - 2⁷ = 43663981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43664109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43664119) 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 15 ways as a sum of consecutive naturals, for example, 21562 + ... + 23499.

It is an arithmetic number, because the mean of its divisors is an integer number (4055580).

Almost surely, 2^43664109 is an apocalyptic number.

It is an amenable number.

43664109 is a deficient number, since it is larger than the sum of its proper divisors (21225171).

43664109 is a wasteful number, since it uses less digits than its factorization.

43664109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45100.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 43664109 is about 6607.8823385408. The cubic root of 43664109 is about 352.1341952392.

The spelling of 43664109 in words is "forty-three million, six hundred sixty-four thousand, one hundred nine".