806512005 has 64 divisors (see below), whose sum is σ = 1570464000. Its totient is φ = 390272256.

The previous prime is 806512001. The next prime is 806512061. The reversal of 806512005 is 500215608.

806512005 is a `hidden beast` number, since 8 + 0 + 651 + 2 + 0 + 0 + 5 = 666.

It is not a de Polignac number, because 806512005 - 2² = 806512001 is a prime.

It is a super-2 number, since 2×806512005² = 1300923228418240050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 806512005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806512001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 99651 + ... + 107439.

It is an arithmetic number, because the mean of its divisors is an integer number (24538500).

Almost surely, 2^806512005 is an apocalyptic number.

It is an amenable number.

806512005 is a deficient number, since it is larger than the sum of its proper divisors (763951995).

806512005 is a wasteful number, since it uses less digits than its factorization.

806512005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7875 (or 7869 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 806512005 is about 28399.1550050349. The cubic root of 806512005 is about 930.8298004862.

The spelling of 806512005 in words is "eight hundred six million, five hundred twelve thousand, five".