64839 has 4 divisors (see below), whose sum is σ = 86456. Its totient is φ = 43224.

The previous prime is 64817. The next prime is 64849. The reversal of 64839 is 93846.

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

It is not a de Polignac number, because 64839 - 2⁹ = 64327 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10804 + ... + 10809.

It is an arithmetic number, because the mean of its divisors is an integer number (21614).

2⁶⁴⁸³⁹ is an apocalyptic number.

64839 is a deficient number, since it is larger than the sum of its proper divisors (21617).

64839 is a wasteful number, since it uses less digits than its factorization.

64839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21616.

The product of its digits is 5184, while the sum is 30.

The square root of 64839 is about 254.6350329393. The cubic root of 64839 is about 40.1740333781.

It can be divided in two parts, 64 and 839, that added together give a triangular number (903 = T₄₂).

The spelling of 64839 in words is "sixty-four thousand, eight hundred thirty-nine".