78823 has 2 divisors, whose sum is σ = 78824. Its totient is φ = 78822.

The previous prime is 78809. The next prime is 78839. The reversal of 78823 is 32887.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (32887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78823 - 2⁵ = 78791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78791 and 78800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78803) 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 as a sum of consecutive naturals, namely, 39411 + 39412.

It is an arithmetic number, because the mean of its divisors is an integer number (39412).

2⁷⁸⁸²³ is an apocalyptic number.

78823 is a deficient number, since it is larger than the sum of its proper divisors (1).

78823 is an equidigital number, since it uses as much as digits as its factorization.

78823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 78823 is about 280.7543410172. The cubic root of 78823 is about 42.8763347906.

The spelling of 78823 in words is "seventy-eight thousand, eight hundred twenty-three".