678317 has 4 divisors (see below), whose sum is σ = 718236. Its totient is φ = 638400.

The previous prime is 678299. The next prime is 678329. The reversal of 678317 is 713876.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 244036 + 434281 = 494^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 678317 - 2⁶ = 678253 is a prime.

It is a super-2 number, since 2×678317² = 920227904978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678317.

It is not an unprimeable number, because it can be changed into a prime (678367) 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 3 ways as a sum of consecutive naturals, for example, 19934 + ... + 19967.

It is an arithmetic number, because the mean of its divisors is an integer number (179559).

2⁶⁷⁸³¹⁷ is an apocalyptic number.

It is an amenable number.

678317 is a deficient number, since it is larger than the sum of its proper divisors (39919).

678317 is a wasteful number, since it uses less digits than its factorization.

678317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39918.

The product of its digits is 7056, while the sum is 32.

The square root of 678317 is about 823.6000242836. The cubic root of 678317 is about 87.8639858193.

The spelling of 678317 in words is "six hundred seventy-eight thousand, three hundred seventeen".