3640565 has 4 divisors (see below), whose sum is σ = 4368684. Its totient is φ = 2912448.

The previous prime is 3640561. The next prime is 3640577. The reversal of 3640565 is 5650463.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2745649 + 894916 = 1657^2 + 946^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640565 - 2² = 3640561 is a prime.

It is a d-powerful number, because it can be written as 3³ + 6⁵ + 4² + 0 + 5 + 6⁸ + 5⁹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640561) 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, 364052 + ... + 364061.

It is an arithmetic number, because the mean of its divisors is an integer number (1092171).

Almost surely, 2^3640565 is an apocalyptic number.

It is an amenable number.

3640565 is a deficient number, since it is larger than the sum of its proper divisors (728119).

3640565 is an equidigital number, since it uses as much as digits as its factorization.

3640565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728118.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 3640565 is about 1908.0264673217. The cubic root of 3640565 is about 153.8353922280.

The spelling of 3640565 in words is "three million, six hundred forty thousand, five hundred sixty-five".