80805105 has 12 divisors (see below), whose sum is σ = 140062260. Its totient is φ = 43096032.

The previous prime is 80805103. The next prime is 80805113. The reversal of 80805105 is 50150808.

It can be written as a sum of positive squares in 2 ways, for example, as 60093504 + 20711601 = 7752^2 + 4551^2 .

It is not a de Polignac number, because 80805105 - 2¹ = 80805103 is a prime.

It is a super-2 number, since 2×80805105² = 13058929988122050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80805103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897790 + ... + 897879.

It is an arithmetic number, because the mean of its divisors is an integer number (11671855).

Almost surely, 2^80805105 is an apocalyptic number.

It is an amenable number.

80805105 is a deficient number, since it is larger than the sum of its proper divisors (59257155).

80805105 is a wasteful number, since it uses less digits than its factorization.

80805105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795680 (or 1795677 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 80805105 is about 8989.1659791106. The cubic root of 80805105 is about 432.3275711241.

The spelling of 80805105 in words is "eighty million, eight hundred five thousand, one hundred five".