3665564 has 48 divisors (see below), whose sum is σ = 7827456. Its totient is φ = 1468800.

The previous prime is 3665539. The next prime is 3665573. The reversal of 3665564 is 4655663.

It is a congruent number.

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, 35537 + ... + 35639.

It is an arithmetic number, because the mean of its divisors is an integer number (163072).

Almost surely, 2^3665564 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 3665564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3913728).

3665564 is an abundant number, since it is smaller than the sum of its proper divisors (4161892).

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

3665564 is a wasteful number, since it uses less digits than its factorization.

3665564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 184 counting only the distinct ones).

The product of its digits is 64800, while the sum is 35.

The square root of 3665564 is about 1914.5662694198. The cubic root of 3665564 is about 154.1867078240.

Subtracting 3665564 from its reverse (4655663), we obtain a palindrome (990099).

The spelling of 3665564 in words is "three million, six hundred sixty-five thousand, five hundred sixty-four".