678871 has 2 divisors, whose sum is σ = 678872. Its totient is φ = 678870.

The previous prime is 678859. The next prime is 678883. The reversal of 678871 is 178876.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (678859) and next prime (678883).

It is a cyclic number.

It is not a de Polignac number, because 678871 - 2¹⁵ = 646103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 678871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339435 + 339436.

It is an arithmetic number, because the mean of its divisors is an integer number (339436).

2⁶⁷⁸⁸⁷¹ is an apocalyptic number.

678871 is a deficient number, since it is larger than the sum of its proper divisors (1).

678871 is an equidigital number, since it uses as much as digits as its factorization.

678871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 37.

The square root of 678871 is about 823.9362839443. The cubic root of 678871 is about 87.8878996149.

It can be divided in two parts, 6788 and 71, that added together give a cube (6859 = 19³).

The spelling of 678871 in words is "six hundred seventy-eight thousand, eight hundred seventy-one".