8644257009 has 8 divisors (see below), whose sum is σ = 12806306720. Its totient is φ = 5762837988.

The previous prime is 8644257001. The next prime is 8644257047. The reversal of 8644257009 is 9007524468.

It is a happy number.

It is not a de Polignac number, because 8644257009 - 2³ = 8644257001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8644257001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160078807 + ... + 160078860.

It is an arithmetic number, because the mean of its divisors is an integer number (1600788340).

Almost surely, 2^8644257009 is an apocalyptic number.

It is an amenable number.

8644257009 is a deficient number, since it is larger than the sum of its proper divisors (4162049711).

8644257009 is a wasteful number, since it uses less digits than its factorization.

8644257009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320157676 (or 320157670 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 8644257009 is about 92974.4965514737. The cubic root of 8644257009 is about 2052.3080891501.

The spelling of 8644257009 in words is "eight billion, six hundred forty-four million, two hundred fifty-seven thousand, nine".