11728569 has 4 divisors (see below), whose sum is σ = 15638096. Its totient is φ = 7819044.

The previous prime is 11728559. The next prime is 11728579. The reversal of 11728569 is 96582711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (11728559) and next prime (11728579).

It is not a de Polignac number, because 11728569 - 2⁵ = 11728537 is a prime.

It is a super-2 number, since 2×11728569² = 275118661575522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11728559) 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, 1954759 + ... + 1954764.

It is an arithmetic number, because the mean of its divisors is an integer number (3909524).

Almost surely, 2^11728569 is an apocalyptic number.

It is an amenable number.

11728569 is a deficient number, since it is larger than the sum of its proper divisors (3909527).

11728569 is an equidigital number, since it uses as much as digits as its factorization.

11728569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909526.

The product of its digits is 30240, while the sum is 39.

The square root of 11728569 is about 3424.6998408620. The cubic root of 11728569 is about 227.2034957081.

The spelling of 11728569 in words is "eleven million, seven hundred twenty-eight thousand, five hundred sixty-nine".