2728810809 has 8 divisors (see below), whose sum is σ = 4042682720. Its totient is φ = 1819207188.

The previous prime is 2728810807. The next prime is 2728810817. The reversal of 2728810809 is 9080188272.

It is a happy number.

It is not a de Polignac number, because 2728810809 - 2¹ = 2728810807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2728810807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50533507 + ... + 50533560.

It is an arithmetic number, because the mean of its divisors is an integer number (505335340).

Almost surely, 2^2728810809 is an apocalyptic number.

It is an amenable number.

2728810809 is a deficient number, since it is larger than the sum of its proper divisors (1313871911).

2728810809 is a wasteful number, since it uses less digits than its factorization.

2728810809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101067076 (or 101067070 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 2728810809 is about 52238.0207224585. The cubic root of 2728810809 is about 1397.4120231824.

The spelling of 2728810809 in words is "two billion, seven hundred twenty-eight million, eight hundred ten thousand, eight hundred nine".