668305 has 16 divisors (see below), whose sum is σ = 907200. Its totient is φ = 468160.

The previous prime is 668303. The next prime is 668347. The reversal of 668305 is 503866.

668305 = 254² + 255² + ... + 263².

It is not a de Polignac number, because 668305 - 2¹ = 668303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1386 + ... + 1804.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2⁶⁶⁸³⁰⁵ is an apocalyptic number.

It is an amenable number.

668305 is a deficient number, since it is larger than the sum of its proper divisors (238895).

668305 is a wasteful number, since it uses less digits than its factorization.

668305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 668305 is about 817.4992354736. The cubic root of 668305 is about 87.4295487330.

The spelling of 668305 in words is "six hundred sixty-eight thousand, three hundred five".