678859 has 2 divisors, whose sum is σ = 678860. Its totient is φ = 678858.

The previous prime is 678833. The next prime is 678871. The reversal of 678859 is 958876.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678859 - 2⁷ = 678731 is a prime.

It is not a weakly prime, because it can be changed into another prime (678809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339429 + 339430.

It is an arithmetic number, because the mean of its divisors is an integer number (339430).

2⁶⁷⁸⁸⁵⁹ is an apocalyptic number.

678859 is a deficient number, since it is larger than the sum of its proper divisors (1).

678859 is an equidigital number, since it uses as much as digits as its factorization.

678859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 678859 is about 823.9290017957. The cubic root of 678859 is about 87.8873817644.

The spelling of 678859 in words is "six hundred seventy-eight thousand, eight hundred fifty-nine".