99668 has 6 divisors (see below), whose sum is σ = 174426. Its totient is φ = 49832.

The previous prime is 99667. The next prime is 99679. The reversal of 99668 is 86699.

It can be written as a sum of positive squares in only one way, i.e., 91204 + 8464 = 302^2 + 92^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99661) 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 as a sum of consecutive naturals, namely, 12455 + ... + 12462.

It is an arithmetic number, because the mean of its divisors is an integer number (29071).

2⁹⁹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

99668 is a deficient number, since it is larger than the sum of its proper divisors (74758).

99668 is a wasteful number, since it uses less digits than its factorization.

99668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24921 (or 24919 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 99668 is about 315.7023915019. The cubic root of 99668 is about 46.3644644686.

It can be divided in two parts, 99 and 668, that added together give a palindrome (767).

The spelling of 99668 in words is "ninety-nine thousand, six hundred sixty-eight".