82639 has 4 divisors (see below), whose sum is σ = 86256. Its totient is φ = 79024.

The previous prime is 82633. The next prime is 82651. The reversal of 82639 is 93628.

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 82639 - 2¹⁵ = 49871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82633) 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, 1774 + ... + 1819.

It is an arithmetic number, because the mean of its divisors is an integer number (21564).

2⁸²⁶³⁹ is an apocalyptic number.

82639 is a deficient number, since it is larger than the sum of its proper divisors (3617).

82639 is a wasteful number, since it uses less digits than its factorization.

82639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616.

The product of its digits is 2592, while the sum is 28.

The square root of 82639 is about 287.4699984346. The cubic root of 82639 is about 43.5573735397.

It can be divided in two parts, 8 and 2639, that multiplied together give a palindrome (21112).

The spelling of 82639 in words is "eighty-two thousand, six hundred thirty-nine".