668616 has 32 divisors (see below), whose sum is σ = 1800960. Its totient is φ = 205632.

The previous prime is 668611. The next prime is 668617. The reversal of 668616 is 616866.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (668611) 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, 760 + ... + 1383.

It is an arithmetic number, because the mean of its divisors is an integer number (56280).

2⁶⁶⁸⁶¹⁶ is an apocalyptic number.

It is an amenable number.

668616 is an abundant number, since it is smaller than the sum of its proper divisors (1132344).

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

668616 is a wasteful number, since it uses less digits than its factorization.

668616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165 (or 2161 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 668616 is about 817.6894275946. The cubic root of 668616 is about 87.4431085962.

The spelling of 668616 in words is "six hundred sixty-eight thousand, six hundred sixteen".