2728805 has 8 divisors (see below), whose sum is σ = 3285144. Its totient is φ = 2176000.

The previous prime is 2728801. The next prime is 2728807. The reversal of 2728805 is 5088272.

2728805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 591361 + 2137444 = 769^2 + 1462^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2728805 - 2² = 2728801 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 (2728801) 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 7 ways as a sum of consecutive naturals, for example, 1325 + ... + 2685.

It is an arithmetic number, because the mean of its divisors is an integer number (410643).

2^2728805 is an apocalyptic number.

It is an amenable number.

2728805 is a deficient number, since it is larger than the sum of its proper divisors (556339).

2728805 is a wasteful number, since it uses less digits than its factorization.

2728805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 2728805 is about 1651.9095011531. The cubic root of 2728805 is about 139.7411031594.

The spelling of 2728805 in words is "two million, seven hundred twenty-eight thousand, eight hundred five".