8665640 has 16 divisors (see below), whose sum is σ = 19497780. Its totient is φ = 3466240.

The previous prime is 8665633. The next prime is 8665649. The reversal of 8665640 is 465668.

It can be written as a sum of positive squares in 2 ways, for example, as 8421604 + 244036 = 2902^2 + 494^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8665640.

It is not an unprimeable number, because it can be changed into a prime (8665649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108281 + ... + 108360.

Almost surely, 2^8665640 is an apocalyptic number.

It is an amenable number.

8665640 is an abundant number, since it is smaller than the sum of its proper divisors (10832140).

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

8665640 is a wasteful number, since it uses less digits than its factorization.

8665640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216652 (or 216648 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 8665640 is about 2943.7459129483. The cubic root of 8665640 is about 205.3998936219.

The spelling of 8665640 in words is "eight million, six hundred sixty-five thousand, six hundred forty".