8640865441 has 16 divisors (see below), whose sum is σ = 9503963280. Its totient is φ = 7806839040.

The previous prime is 8640865421. The next prime is 8640865483. The reversal of 8640865441 is 1445680468.

It can be written as a sum of positive squares in 8 ways, for example, as 3906875025 + 4733990416 = 62505^2 + 68804^2 .

It is not a de Polignac number, because 8640865441 - 2²³ = 8632476833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8640865391 and 8640865400.

It is not an unprimeable number, because it can be changed into a prime (8640865421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275175 + ... + 304963.

It is an arithmetic number, because the mean of its divisors is an integer number (593997705).

Almost surely, 2^8640865441 is an apocalyptic number.

It is an amenable number.

8640865441 is a deficient number, since it is larger than the sum of its proper divisors (863097839).

8640865441 is a wasteful number, since it uses less digits than its factorization.

8640865441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30276.

The product of its (nonzero) digits is 737280, while the sum is 46.

The square root of 8640865441 is about 92956.2555237677. The cubic root of 8640865441 is about 2052.0396468400.

The spelling of 8640865441 in words is "eight billion, six hundred forty million, eight hundred sixty-five thousand, four hundred forty-one".