6565640 has 64 divisors (see below), whose sum is σ = 15940800. Its totient is φ = 2426112.

The previous prime is 6565633. The next prime is 6565661. The reversal of 6565640 is 465656.

It is a junction number, because it is equal to n+sod(n) for n = 6565597 and 6565606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40199 + ... + 40361.

It is an arithmetic number, because the mean of its divisors is an integer number (249075).

Almost surely, 2^6565640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6565640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7970400).

6565640 is an abundant number, since it is smaller than the sum of its proper divisors (9375160).

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

6565640 is a wasteful number, since it uses less digits than its factorization.

6565640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 6565640 is about 2562.3504834429. The cubic root of 6565640 is about 187.2516653120.

The spelling of 6565640 in words is "six million, five hundred sixty-five thousand, six hundred forty".