78986 has 8 divisors (see below), whose sum is σ = 120324. Its totient is φ = 38880.

The previous prime is 78979. The next prime is 78989. The reversal of 78986 is 68987.

It can be written as a sum of positive squares in 2 ways, for example, as 78961 + 25 = 281^2 + 5^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (78989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125 + ... + 416.

2⁷⁸⁹⁸⁶ is an apocalyptic number.

78986 is a deficient number, since it is larger than the sum of its proper divisors (41338).

78986 is a wasteful number, since it uses less digits than its factorization.

78986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616.

The product of its digits is 24192, while the sum is 38.

The square root of 78986 is about 281.0444804653. The cubic root of 78986 is about 42.9058694468.

Subtracting from 78986 its reverse (68987), we obtain a palindrome (9999).

The spelling of 78986 in words is "seventy-eight thousand, nine hundred eighty-six".