11280065 has 4 divisors (see below), whose sum is σ = 13536084. Its totient is φ = 9024048.

The previous prime is 11280041. The next prime is 11280067. The reversal of 11280065 is 56008211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56008211 = 7 ⋅8001173.

It can be written as a sum of positive squares in 2 ways, for example, as 9006001 + 2274064 = 3001^2 + 1508^2 .

It is a cyclic number.

It is not a de Polignac number, because 11280065 - 2⁸ = 11279809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11280065.

It is not an unprimeable number, because it can be changed into a prime (11280067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1128002 + ... + 1128011.

It is an arithmetic number, because the mean of its divisors is an integer number (3384021).

Almost surely, 2^11280065 is an apocalyptic number.

It is an amenable number.

11280065 is a deficient number, since it is larger than the sum of its proper divisors (2256019).

11280065 is an equidigital number, since it uses as much as digits as its factorization.

11280065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256018.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 11280065 is about 3358.5808014696. The cubic root of 11280065 is about 224.2696648672.

Adding to 11280065 its reverse (56008211), we get a palindrome (67288276).

The spelling of 11280065 in words is "eleven million, two hundred eighty thousand, sixty-five".