668652 has 12 divisors (see below), whose sum is σ = 1560216. Its totient is φ = 222880.

The previous prime is 668623. The next prime is 668671. The reversal of 668652 is 256866.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27849 + ... + 27872.

It is an arithmetic number, because the mean of its divisors is an integer number (130018).

2⁶⁶⁸⁶⁵² is an apocalyptic number.

It is an amenable number.

668652 is an abundant number, since it is smaller than the sum of its proper divisors (891564).

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

668652 is a wasteful number, since it uses less digits than its factorization.

668652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55728 (or 55726 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 668652 is about 817.7114405461. The cubic root of 668652 is about 87.4446779551. Note that the first 3 decimals are identical.

The spelling of 668652 in words is "six hundred sixty-eight thousand, six hundred fifty-two".