99678 has 16 divisors (see below), whose sum is σ = 205200. Its totient is φ = 32256.

The previous prime is 99667. The next prime is 99679. The reversal of 99678 is 87699.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99679) by changing a digit.

99678 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, 3 + ... + 446.

It is an arithmetic number, because the mean of its divisors is an integer number (12825).

2⁹⁹⁶⁷⁸ is an apocalyptic number.

99678 is an abundant number, since it is smaller than the sum of its proper divisors (105522).

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 (102600).

99678 is a wasteful number, since it uses less digits than its factorization.

99678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491.

The product of its digits is 27216, while the sum is 39.

The square root of 99678 is about 315.7182288054. The cubic root of 99678 is about 46.3660150470.

It can be divided in two parts, 99 and 678, that added together give a palindrome (777).

The spelling of 99678 in words is "ninety-nine thousand, six hundred seventy-eight".