78684 has 24 divisors (see below), whose sum is σ = 188160. Its totient is φ = 25584.

The previous prime is 78653. The next prime is 78691. The reversal of 78684 is 48687.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 907 + ... + 989.

It is an arithmetic number, because the mean of its divisors is an integer number (7840).

2⁷⁸⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

78684 is an abundant number, since it is smaller than the sum of its proper divisors (109476).

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 (94080).

78684 is a wasteful number, since it uses less digits than its factorization.

78684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 167 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 78684 is about 280.5066844123. The cubic root of 78684 is about 42.8511166130.

The spelling of 78684 in words is "seventy-eight thousand, six hundred eighty-four".