43664479 has 4 divisors (see below), whose sum is σ = 44679976. Its totient is φ = 42648984.

The previous prime is 43664441. The next prime is 43664497. The reversal of 43664479 is 97446634.

43664479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43664479 - 2⁷ = 43664351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1015453 = 43664479 / (4 + 3 + 6 + 6 + 4 + 4 + 7 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43664429) 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 3 ways as a sum of consecutive naturals, for example, 507684 + ... + 507769.

It is an arithmetic number, because the mean of its divisors is an integer number (11169994).

Almost surely, 2^43664479 is an apocalyptic number.

43664479 is a deficient number, since it is larger than the sum of its proper divisors (1015497).

43664479 is a wasteful number, since it uses less digits than its factorization.

43664479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015496.

The product of its digits is 435456, while the sum is 43.

The square root of 43664479 is about 6607.9103353481. The cubic root of 43664479 is about 352.1351898721.

The spelling of 43664479 in words is "forty-three million, six hundred sixty-four thousand, four hundred seventy-nine".