78559 has 4 divisors (see below), whose sum is σ = 84616. Its totient is φ = 72504.

The previous prime is 78553. The next prime is 78569. The reversal of 78559 is 95587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95587 = 61 ⋅1567.

It is a cyclic number.

It is not a de Polignac number, because 78559 - 2¹¹ = 76511 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 (78553) 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, 3009 + ... + 3034.

It is an arithmetic number, because the mean of its divisors is an integer number (21154).

2⁷⁸⁵⁵⁹ is an apocalyptic number.

78559 is a deficient number, since it is larger than the sum of its proper divisors (6057).

78559 is a wasteful number, since it uses less digits than its factorization.

78559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6056.

The product of its digits is 12600, while the sum is 34.

The square root of 78559 is about 280.2837847611. The cubic root of 78559 is about 42.8284130200.

The spelling of 78559 in words is "seventy-eight thousand, five hundred fifty-nine".