2728906 has 4 divisors (see below), whose sum is σ = 4093362. Its totient is φ = 1364452.

The previous prime is 2728889. The next prime is 2728907. The reversal of 2728906 is 6098272.

2728906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2576025 + 152881 = 1605^2 + 391^2 .

It is not an unprimeable number, because it can be changed into a prime (2728907) 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 as a sum of consecutive naturals, namely, 682225 + ... + 682228.

2^2728906 is an apocalyptic number.

2728906 is a deficient number, since it is larger than the sum of its proper divisors (1364456).

2728906 is a wasteful number, since it uses less digits than its factorization.

2728906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364455.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 2728906 is about 1651.9400715522. The cubic root of 2728906 is about 139.7428271958.

The spelling of 2728906 in words is "two million, seven hundred twenty-eight thousand, nine hundred six".