678706139 has 2 divisors, whose sum is σ = 678706140. Its totient is φ = 678706138.

The previous prime is 678706123. The next prime is 678706151. The reversal of 678706139 is 931607876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678706139 - 2⁴ = 678706123 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 678706093 and 678706102.

It is not a weakly prime, because it can be changed into another prime (678706339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339353069 + 339353070.

It is an arithmetic number, because the mean of its divisors is an integer number (339353070).

Almost surely, 2^678706139 is an apocalyptic number.

678706139 is a deficient number, since it is larger than the sum of its proper divisors (1).

678706139 is an equidigital number, since it uses as much as digits as its factorization.

678706139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 678706139 is about 26051.9891563005. The cubic root of 678706139 is about 878.8078463526.

The spelling of 678706139 in words is "six hundred seventy-eight million, seven hundred six thousand, one hundred thirty-nine".