988668 has 36 divisors (see below), whose sum is σ = 2588040. Its totient is φ = 317856.

The previous prime is 988661. The next prime is 988681. The reversal of 988668 is 866889.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 571 + ... + 1517.

It is an arithmetic number, because the mean of its divisors is an integer number (71890).

2⁹⁸⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 988668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294020).

988668 is an abundant number, since it is smaller than the sum of its proper divisors (1599372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

988668 is a wasteful number, since it uses less digits than its factorization.

988668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986 (or 981 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 988668 is about 994.3178566233. The cubic root of 988668 is about 99.6208307909.

The spelling of 988668 in words is "nine hundred eighty-eight thousand, six hundred sixty-eight".