78918 has 16 divisors (see below), whose sum is σ = 180480. Its totient is φ = 22536.

The previous prime is 78901. The next prime is 78919. The reversal of 78918 is 81987.

It is a Curzon 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 (78919) 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 7 ways as a sum of consecutive naturals, for example, 898 + ... + 981.

It is an arithmetic number, because the mean of its divisors is an integer number (11280).

2⁷⁸⁹¹⁸ is an apocalyptic number.

78918 is an abundant number, since it is smaller than the sum of its proper divisors (101562).

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 (90240).

78918 is a wasteful number, since it uses less digits than its factorization.

78918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891.

The product of its digits is 4032, while the sum is 33.

The square root of 78918 is about 280.9234771250. The cubic root of 78918 is about 42.8935531849.

It can be divided in two parts, 7 and 8918, that multiplied together give a palindrome (62426).

The spelling of 78918 in words is "seventy-eight thousand, nine hundred eighteen".