82805005 has 8 divisors (see below), whose sum is σ = 102792600. Its totient is φ = 63959616.

The previous prime is 82805003. The next prime is 82805039. The reversal of 82805005 is 50050828.

It can be written as a sum of positive squares in 4 ways, for example, as 2128681 + 80676324 = 1459^2 + 8982^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82805005 - 2¹ = 82805003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82805003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285390 + ... + 285679.

It is an arithmetic number, because the mean of its divisors is an integer number (12849075).

Almost surely, 2^82805005 is an apocalyptic number.

It is an amenable number.

82805005 is a deficient number, since it is larger than the sum of its proper divisors (19987595).

82805005 is a wasteful number, since it uses less digits than its factorization.

82805005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571103.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 82805005 is about 9099.7255453118. The cubic root of 82805005 is about 435.8652001002.

The spelling of 82805005 in words is "eighty-two million, eight hundred five thousand, five".