678839041 has 2 divisors, whose sum is σ = 678839042. Its totient is φ = 678839040.

The previous prime is 678839039. The next prime is 678839069. The reversal of 678839041 is 140938876.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 615238416 + 63600625 = 24804^2 + 7975^2 .

It is a cyclic number.

It is not a de Polignac number, because 678839041 - 2¹ = 678839039 is a prime.

Together with 678839039, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 678838982 and 678839000.

It is not a weakly prime, because it can be changed into another prime (678839071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339419520 + 339419521.

It is an arithmetic number, because the mean of its divisors is an integer number (339419521).

Almost surely, 2^678839041 is an apocalyptic number.

It is an amenable number.

678839041 is a deficient number, since it is larger than the sum of its proper divisors (1).

678839041 is an equidigital number, since it uses as much as digits as its factorization.

678839041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 678839041 is about 26054.5397387864. The cubic root of 678839041 is about 878.8652043612.

The spelling of 678839041 in words is "six hundred seventy-eight million, eight hundred thirty-nine thousand, forty-one".