80005 has 4 divisors (see below), whose sum is σ = 96012. Its totient is φ = 64000.

The previous prime is 79999. The next prime is 80021. The reversal of 80005 is 50008.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49729 + 30276 = 223^2 + 174^2 .

It is not a de Polignac number, because 80005 - 2³ = 79997 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7996 + ... + 8005.

It is an arithmetic number, because the mean of its divisors is an integer number (24003).

2⁸⁰⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

80005 is a deficient number, since it is larger than the sum of its proper divisors (16007).

80005 is a wasteful number, since it uses less digits than its factorization.

80005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16006.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 80005 is about 282.8515511713. The cubic root of 80005 is about 43.0895914631.

It can be divided in two parts, 8000 and 5, that multiplied together give a square (40000 = 200²).

The spelling of 80005 in words is "eighty thousand, five".