678587017 has 2 divisors, whose sum is σ = 678587018. Its totient is φ = 678587016.

The previous prime is 678587003. The next prime is 678587053. The reversal of 678587017 is 710785876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 672416761 + 6170256 = 25931^2 + 2484^2 .

It is a cyclic number.

It is not a de Polignac number, because 678587017 - 2¹⁵ = 678554249 is a prime.

It is not a weakly prime, because it can be changed into another prime (678587057) 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, 339293508 + 339293509.

It is an arithmetic number, because the mean of its divisors is an integer number (339293509).

Almost surely, 2^678587017 is an apocalyptic number.

It is an amenable number.

678587017 is a deficient number, since it is larger than the sum of its proper divisors (1).

678587017 is an equidigital number, since it uses as much as digits as its factorization.

678587017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 658560, while the sum is 49.

The square root of 678587017 is about 26049.7028198020. The cubic root of 678587017 is about 878.7564291695.

The spelling of 678587017 in words is "six hundred seventy-eight million, five hundred eighty-seven thousand, seventeen".