2708890209 has 15 divisors (see below), whose sum is σ = 4047313633. Its totient is φ = 1805614524.

The previous prime is 2708890201. The next prime is 2708890237. The reversal of 2708890209 is 9020988072.

The square root of 2708890209 is 52047.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2708890209 - 2³ = 2708890201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2708890201) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 465532 + ... + 471314.

Almost surely, 2^2708890209 is an apocalyptic number.

2708890209 is the 52047-th square number.

2708890209 is the 26024-th centered octagonal number.

It is an amenable number.

2708890209 is a deficient number, since it is larger than the sum of its proper divisors (1338423424).

2708890209 is an frugal number, since it uses more digits than its factorization.

2708890209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11578 (or 5786 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The cubic root of 2708890209 is about 1394.0032977560.

The spelling of 2708890209 in words is "two billion, seven hundred eight million, eight hundred ninety thousand, two hundred nine".