678217 has 2 divisors, whose sum is σ = 678218. Its totient is φ = 678216.

The previous prime is 678211. The next prime is 678221. The reversal of 678217 is 712876.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622521 + 55696 = 789^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 678217 - 2¹⁹ = 153929 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678217.

It is not a weakly prime, because it can be changed into another prime (678211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339108 + 339109.

It is an arithmetic number, because the mean of its divisors is an integer number (339109).

2⁶⁷⁸²¹⁷ is an apocalyptic number.

It is an amenable number.

678217 is a deficient number, since it is larger than the sum of its proper divisors (1).

678217 is an equidigital number, since it uses as much as digits as its factorization.

678217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 678217 is about 823.5393129657. The cubic root of 678217 is about 87.8596678626.

The spelling of 678217 in words is "six hundred seventy-eight thousand, two hundred seventeen".