668868 has 24 divisors (see below), whose sum is σ = 1575840. Its totient is φ = 220800.

The previous prime is 668867. The next prime is 668869. The reversal of 668868 is 868866.

It is an interprime number because it is at equal distance from previous prime (668867) and next prime (668869).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1468 + ... + 1868.

It is an arithmetic number, because the mean of its divisors is an integer number (65660).

2⁶⁶⁸⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

668868 is an abundant number, since it is smaller than the sum of its proper divisors (906972).

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

668868 is a wasteful number, since it uses less digits than its factorization.

668868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 545 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 668868 is about 817.8435058127. The cubic root of 668868 is about 87.4540929258.

The spelling of 668868 in words is "six hundred sixty-eight thousand, eight hundred sixty-eight".