668247 has 8 divisors (see below), whose sum is σ = 921840. Its totient is φ = 430080.

The previous prime is 668243. The next prime is 668273. The reversal of 668247 is 742866.

668247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 668247 - 2² = 668243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3754 + ... + 3927.

It is an arithmetic number, because the mean of its divisors is an integer number (115230).

2⁶⁶⁸²⁴⁷ is an apocalyptic number.

668247 is a deficient number, since it is larger than the sum of its proper divisors (253593).

668247 is a wasteful number, since it uses less digits than its factorization.

668247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7713.

The product of its digits is 16128, while the sum is 33.

The square root of 668247 is about 817.4637606647. The cubic root of 668247 is about 87.4270194186.

The spelling of 668247 in words is "six hundred sixty-eight thousand, two hundred forty-seven".