2808645309 has 6 divisors (see below), whose sum is σ = 4056932126. Its totient is φ = 1872430200.

The previous prime is 2808645221. The next prime is 2808645311. The reversal of 2808645309 is 9035468082.

2808645309 is a `hidden beast` number, since 280 + 8 + 64 + 5 + 309 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1814504409 + 994140900 = 42597^2 + 31530^2 .

It is not a de Polignac number, because 2808645309 - 2²⁹ = 2271774397 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 (2808655309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156035842 + ... + 156035859.

Almost surely, 2^2808645309 is an apocalyptic number.

It is an amenable number.

2808645309 is a deficient number, since it is larger than the sum of its proper divisors (1248286817).

2808645309 is a wasteful number, since it uses less digits than its factorization.

2808645309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312071707 (or 312071704 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 2808645309 is about 52996.6537528550. The cubic root of 2808645309 is about 1410.9088768217.

The spelling of 2808645309 in words is "two billion, eight hundred eight million, six hundred forty-five thousand, three hundred nine".