80639 has 4 divisors (see below), whose sum is σ = 86856. Its totient is φ = 74424.

The previous prime is 80629. The next prime is 80651. The reversal of 80639 is 93608.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 80639 - 2¹² = 76543 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80629) 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 3 ways as a sum of consecutive naturals, for example, 3089 + ... + 3114.

It is an arithmetic number, because the mean of its divisors is an integer number (21714).

2⁸⁰⁶³⁹ is an apocalyptic number.

80639 is a deficient number, since it is larger than the sum of its proper divisors (6217).

80639 is a wasteful number, since it uses less digits than its factorization.

80639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 80639 is about 283.9700688453. The cubic root of 80639 is about 43.2031133444.

The spelling of 80639 in words is "eighty thousand, six hundred thirty-nine".