2728105 has 4 divisors (see below), whose sum is σ = 3273732. Its totient is φ = 2182480.

The previous prime is 2728097. The next prime is 2728129. The reversal of 2728105 is 5018272.

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 1058841 + 1669264 = 1029^2 + 1292^2 .

It is not a de Polignac number, because 2728105 - 2³ = 2728097 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 2728105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272806 + ... + 272815.

It is an arithmetic number, because the mean of its divisors is an integer number (818433).

2^2728105 is an apocalyptic number.

It is an amenable number.

2728105 is a deficient number, since it is larger than the sum of its proper divisors (545627).

2728105 is an equidigital number, since it uses as much as digits as its factorization.

2728105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545626.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2728105 is about 1651.6976115500. The cubic root of 2728105 is about 139.7291532231.

The spelling of 2728105 in words is "two million, seven hundred twenty-eight thousand, one hundred five".