668320 has 24 divisors (see below), whose sum is σ = 1579284. Its totient is φ = 267264.

The previous prime is 668303. The next prime is 668347. The reversal of 668320 is 23866.

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 21904 = 804^2 + 148^2 .

It is an unprimeable number.

668320 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1929 + ... + 2248.

2⁶⁶⁸³²⁰ is an apocalyptic number.

It is an amenable number.

668320 is an abundant number, since it is smaller than the sum of its proper divisors (910964).

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

668320 is a wasteful number, since it uses less digits than its factorization.

668320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192 (or 4184 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 668320 is about 817.5084097427. The cubic root of 668320 is about 87.4302028423.

The spelling of 668320 in words is "six hundred sixty-eight thousand, three hundred twenty".