2728205 has 4 divisors (see below), whose sum is σ = 3273852. Its totient is φ = 2182560.

The previous prime is 2728199. The next prime is 2728207. The reversal of 2728205 is 5028272.

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 708964 + 2019241 = 842^2 + 1421^2 .

It is not a de Polignac number, because 2728205 - 2¹² = 2724109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2728207) 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, 272816 + ... + 272825.

It is an arithmetic number, because the mean of its divisors is an integer number (818463).

2^2728205 is an apocalyptic number.

It is an amenable number.

2728205 is a deficient number, since it is larger than the sum of its proper divisors (545647).

2728205 is an equidigital number, since it uses as much as digits as its factorization.

2728205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545646.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 2728205 is about 1651.7278831575. The cubic root of 2728205 is about 139.7308604820.

The spelling of 2728205 in words is "two million, seven hundred twenty-eight thousand, two hundred five".