668385 has 16 divisors (see below), whose sum is σ = 1188480. Its totient is φ = 356400.

The previous prime is 668347. The next prime is 668407. The reversal of 668385 is 583866.

It is not a de Polignac number, because 668385 - 2¹⁰ = 667361 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2341 + ... + 2610.

It is an arithmetic number, because the mean of its divisors is an integer number (74280).

2⁶⁶⁸³⁸⁵ is an apocalyptic number.

It is an amenable number.

668385 is a deficient number, since it is larger than the sum of its proper divisors (520095).

668385 is a wasteful number, since it uses less digits than its factorization.

668385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965 (or 4959 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 668385 is about 817.5481637188. The cubic root of 668385 is about 87.4330372025.

The spelling of 668385 in words is "six hundred sixty-eight thousand, three hundred eighty-five".