80709 has 4 divisors (see below), whose sum is σ = 107616. Its totient is φ = 53804.

The previous prime is 80701. The next prime is 80713. The reversal of 80709 is 90708.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80709 - 2³ = 80701 is a prime.

It is a D-number.

It is a congruent 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, 13449 + ... + 13454.

It is an arithmetic number, because the mean of its divisors is an integer number (26904).

2⁸⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

80709 is a deficient number, since it is larger than the sum of its proper divisors (26907).

80709 is a wasteful number, since it uses less digits than its factorization.

80709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26906.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 80709 is about 284.0932945354. The cubic root of 80709 is about 43.2156107848.

Subtracting 80709 from its reverse (90708), we obtain a palindrome (9999).

The spelling of 80709 in words is "eighty thousand, seven hundred nine".