78711 has 4 divisors (see below), whose sum is σ = 104952. Its totient is φ = 52472.

The previous prime is 78707. The next prime is 78713. The reversal of 78711 is 11787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11787 = 3 ⋅3929.

It is a cyclic number.

It is not a de Polignac number, because 78711 - 2² = 78707 is a prime.

It is a D-number.

78711 is a lucky 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 (78713) 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, 13116 + ... + 13121.

It is an arithmetic number, because the mean of its divisors is an integer number (26238).

2⁷⁸⁷¹¹ is an apocalyptic number.

78711 is a deficient number, since it is larger than the sum of its proper divisors (26241).

78711 is a wasteful number, since it uses less digits than its factorization.

78711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26240.

The product of its digits is 392, while the sum is 24.

The square root of 78711 is about 280.5548074798. The cubic root of 78711 is about 42.8560174308.

Subtracting from 78711 its sum of digits (24), we obtain a palindrome (78687).

The spelling of 78711 in words is "seventy-eight thousand, seven hundred eleven".