2728909 has 4 divisors (see below), whose sum is σ = 2792416. Its totient is φ = 2665404.

The previous prime is 2728907. The next prime is 2728931. The reversal of 2728909 is 9098272.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2728909 - 2¹ = 2728907 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 (2728907) 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, 31689 + ... + 31774.

It is an arithmetic number, because the mean of its divisors is an integer number (698104).

2^2728909 is an apocalyptic number.

It is an amenable number.

2728909 is a deficient number, since it is larger than the sum of its proper divisors (63507).

2728909 is an equidigital number, since it uses as much as digits as its factorization.

2728909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63506.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 2728909 is about 1651.9409795752. The cubic root of 2728909 is about 139.7428784041.

The spelling of 2728909 in words is "two million, seven hundred twenty-eight thousand, nine hundred nine".