11728565 has 4 divisors (see below), whose sum is σ = 14074284. Its totient is φ = 9382848.

The previous prime is 11728559. The next prime is 11728579. The reversal of 11728565 is 56582711.

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 6355441 + 5373124 = 2521^2 + 2318^2 .

It is a cyclic number.

It is not a de Polignac number, because 11728565 - 2⁸ = 11728309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1172852 + ... + 1172861.

It is an arithmetic number, because the mean of its divisors is an integer number (3518571).

Almost surely, 2^11728565 is an apocalyptic number.

It is an amenable number.

11728565 is a deficient number, since it is larger than the sum of its proper divisors (2345719).

11728565 is an equidigital number, since it uses as much as digits as its factorization.

11728565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345718.

The product of its digits is 16800, while the sum is 35.

The square root of 11728565 is about 3424.6992568691. The cubic root of 11728565 is about 227.2034698790.

It can be divided in two parts, 117 and 28565, that added together give a palindrome (28682).

The spelling of 11728565 in words is "eleven million, seven hundred twenty-eight thousand, five hundred sixty-five".