8218665 has 80 divisors (see below), whose sum is σ = 18213888. Its totient is φ = 3452544.

The previous prime is 8218663. The next prime is 8218669. The reversal of 8218665 is 5668128.

It is a happy number.

8218665 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8218665 - 2¹ = 8218663 is a prime.

8218665 is strictly pandigital in base 8.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8218663) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 36744 + ... + 36966.

Almost surely, 2^8218665 is an apocalyptic number.

It is an amenable number.

8218665 is an abundant number, since it is smaller than the sum of its proper divisors (9995223).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8218665 is a wasteful number, since it uses less digits than its factorization.

8218665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 251 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 8218665 is about 2866.8214105521. The cubic root of 8218665 is about 201.8058537194.

The spelling of 8218665 in words is "eight million, two hundred eighteen thousand, six hundred sixty-five".