2809020105 has 48 divisors (see below), whose sum is σ = 4928551056. Its totient is φ = 1479905280.

The previous prime is 2809020043. The next prime is 2809020139. The reversal of 2809020105 is 5010209082.

It can be written as a sum of positive squares in 8 ways, for example, as 449100864 + 2359919241 = 21192^2 + 48579^2 .

It is not a de Polignac number, because 2809020105 - 2⁷ = 2809019977 is a prime.

It is a super-2 number, since 2×2809020105² = 15781187900588422050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1895965 + ... + 1897445.

It is an arithmetic number, because the mean of its divisors is an integer number (102678147).

Almost surely, 2^2809020105 is an apocalyptic number.

It is an amenable number.

2809020105 is a deficient number, since it is larger than the sum of its proper divisors (2119530951).

2809020105 is a wasteful number, since it uses less digits than its factorization.

2809020105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 2809020105 is about 53000.1896694719. The cubic root of 2809020105 is about 1410.9716329936.

Adding to 2809020105 its reverse (5010209082), we get a palindrome (7819229187).

The spelling of 2809020105 in words is "two billion, eight hundred nine million, twenty thousand, one hundred five".