80705 has 4 divisors (see below), whose sum is σ = 96852. Its totient is φ = 64560.

The previous prime is 80701. The next prime is 80713. The reversal of 80705 is 50708.

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 30976 + 49729 = 176^2 + 223^2 .

It is not a de Polignac number, because 80705 - 2² = 80701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8066 + ... + 8075.

It is an arithmetic number, because the mean of its divisors is an integer number (24213).

2⁸⁰⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

80705 is a deficient number, since it is larger than the sum of its proper divisors (16147).

80705 is a wasteful number, since it uses less digits than its factorization.

80705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16146.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 80705 is about 284.0862545073. The cubic root of 80705 is about 43.2148968401.

The spelling of 80705 in words is "eighty thousand, seven hundred five".