2800565 has 4 divisors (see below), whose sum is σ = 3360684. Its totient is φ = 2240448.

The previous prime is 2800561. The next prime is 2800583. The reversal of 2800565 is 5650082.

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 508369 + 2292196 = 713^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 2800565 - 2² = 2800561 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2800561) 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, 280052 + ... + 280061.

It is an arithmetic number, because the mean of its divisors is an integer number (840171).

2^2800565 is an apocalyptic number.

It is an amenable number.

2800565 is a deficient number, since it is larger than the sum of its proper divisors (560119).

2800565 is an equidigital number, since it uses as much as digits as its factorization.

2800565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560118.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 2800565 is about 1673.4888705934. The cubic root of 2800565 is about 140.9554542984.

The spelling of 2800565 in words is "two million, eight hundred thousand, five hundred sixty-five".