8643444909 has 24 divisors (see below), whose sum is σ = 12678113280. Its totient is φ = 5234074560.

The previous prime is 8643444883. The next prime is 8643444917. The reversal of 8643444909 is 9094443468.

It is not a de Polignac number, because 8643444909 - 2⁵ = 8643444877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8643444409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 454969 + ... + 473585.

It is an arithmetic number, because the mean of its divisors is an integer number (528254720).

Almost surely, 2^8643444909 is an apocalyptic number.

It is an amenable number.

8643444909 is a deficient number, since it is larger than the sum of its proper divisors (4034668371).

8643444909 is a wasteful number, since it uses less digits than its factorization.

8643444909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19921 (or 19910 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 51.

The square root of 8643444909 is about 92970.1291222078. The cubic root of 8643444909 is about 2052.2438179007.

The spelling of 8643444909 in words is "eight billion, six hundred forty-three million, four hundred forty-four thousand, nine hundred nine".