668847 has 8 divisors (see below), whose sum is σ = 900144. Its totient is φ = 441728.

The previous prime is 668821. The next prime is 668851. The reversal of 668847 is 748866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668847 - 2⁷ = 668719 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668867) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 648 + ... + 1325.

It is an arithmetic number, because the mean of its divisors is an integer number (112518).

2⁶⁶⁸⁸⁴⁷ is an apocalyptic number.

668847 is a deficient number, since it is larger than the sum of its proper divisors (231297).

668847 is a wasteful number, since it uses less digits than its factorization.

668847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089.

The product of its digits is 64512, while the sum is 39.

The square root of 668847 is about 817.8306670699. The cubic root of 668847 is about 87.4531776704.

The spelling of 668847 in words is "six hundred sixty-eight thousand, eight hundred forty-seven".