678808859 has 2 divisors, whose sum is σ = 678808860. Its totient is φ = 678808858.

The previous prime is 678808847. The next prime is 678808909. The reversal of 678808859 is 958808876.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678808859 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 678808798 and 678808807.

It is not a weakly prime, because it can be changed into another prime (678808159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339404429 + 339404430.

It is an arithmetic number, because the mean of its divisors is an integer number (339404430).

Almost surely, 2^678808859 is an apocalyptic number.

678808859 is a deficient number, since it is larger than the sum of its proper divisors (1).

678808859 is an equidigital number, since it uses as much as digits as its factorization.

678808859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7741440, while the sum is 59.

The square root of 678808859 is about 26053.9605242658. The cubic root of 678808859 is about 878.8521790336.

The spelling of 678808859 in words is "six hundred seventy-eight million, eight hundred eight thousand, eight hundred fifty-nine".