2880805 has 4 divisors (see below), whose sum is σ = 3456972. Its totient is φ = 2304640.

The previous prime is 2880797. The next prime is 2880809. The reversal of 2880805 is 5080882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5080882 = 2 ⋅2540441.

It can be written as a sum of positive squares in 2 ways, for example, as 1718721 + 1162084 = 1311^2 + 1078^2 .

It is not a de Polignac number, because 2880805 - 2³ = 2880797 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2880805 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2880809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288076 + ... + 288085.

It is an arithmetic number, because the mean of its divisors is an integer number (864243).

2^2880805 is an apocalyptic number.

It is an amenable number.

2880805 is a deficient number, since it is larger than the sum of its proper divisors (576167).

2880805 is an equidigital number, since it uses as much as digits as its factorization.

2880805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576166.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 2880805 is about 1697.2934336761. The cubic root of 2880805 is about 142.2889869591.

The spelling of 2880805 in words is "two million, eight hundred eighty thousand, eight hundred five".