668913 has 16 divisors (see below), whose sum is σ = 1040256. Its totient is φ = 374400.

The previous prime is 668903. The next prime is 668929. The reversal of 668913 is 319866.

668913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668913 - 2¹⁷ = 537841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668903) 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, 813 + ... + 1413.

It is an arithmetic number, because the mean of its divisors is an integer number (65016).

2⁶⁶⁸⁹¹³ is an apocalyptic number.

It is an amenable number.

668913 is a deficient number, since it is larger than the sum of its proper divisors (371343).

668913 is a wasteful number, since it uses less digits than its factorization.

668913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its digits is 7776, while the sum is 33.

The square root of 668913 is about 817.8710167257. The cubic root of 668913 is about 87.4560541229.

The spelling of 668913 in words is "six hundred sixty-eight thousand, nine hundred thirteen".