78786 has 16 divisors (see below), whose sum is σ = 175200. Its totient is φ = 26244.

The previous prime is 78781. The next prime is 78787. The reversal of 78786 is 68787.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 78786.

It is not an unprimeable number, because it can be changed into a prime (78781) by changing a digit.

78786 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676 + ... + 783.

It is an arithmetic number, because the mean of its divisors is an integer number (10950).

2⁷⁸⁷⁸⁶ is an apocalyptic number.

78786 is an abundant number, since it is smaller than the sum of its proper divisors (96414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87600).

78786 is a wasteful number, since it uses less digits than its factorization.

78786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470 (or 1464 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 78786 is about 280.6884393772. The cubic root of 78786 is about 42.8696249357.

Subtracting from 78786 its reverse (68787), we obtain a palindrome (9999).

The spelling of 78786 in words is "seventy-eight thousand, seven hundred eighty-six".