2808638945 has 16 divisors (see below), whose sum is σ = 3906102528. Its totient is φ = 1898796480.

The previous prime is 2808638941. The next prime is 2808638947. The reversal of 2808638945 is 5498368082.

It is not a de Polignac number, because 2808638945 - 2² = 2808638941 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2808638941) 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 15 ways as a sum of consecutive naturals, for example, 562634 + ... + 567603.

It is an arithmetic number, because the mean of its divisors is an integer number (244131408).

Almost surely, 2^2808638945 is an apocalyptic number.

It is an amenable number.

2808638945 is a deficient number, since it is larger than the sum of its proper divisors (1097463583).

2808638945 is a wasteful number, since it uses less digits than its factorization.

2808638945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130320.

The product of its (nonzero) digits is 3317760, while the sum is 53.

The square root of 2808638945 is about 52996.5937112943. The cubic root of 2808638945 is about 1410.9078111798.

The spelling of 2808638945 in words is "two billion, eight hundred eight million, six hundred thirty-eight thousand, nine hundred forty-five".