678586049 has 2 divisors, whose sum is σ = 678586050. Its totient is φ = 678586048.

The previous prime is 678586037. The next prime is 678586067. The reversal of 678586049 is 940685876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359785024 + 318801025 = 18968^2 + 17855^2 .

It is a cyclic number.

It is not a de Polignac number, because 678586049 - 2⁴ = 678586033 is a prime.

It is not a weakly prime, because it can be changed into another prime (678586009) 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, 339293024 + 339293025.

It is an arithmetic number, because the mean of its divisors is an integer number (339293025).

Almost surely, 2^678586049 is an apocalyptic number.

It is an amenable number.

678586049 is a deficient number, since it is larger than the sum of its proper divisors (1).

678586049 is an equidigital number, since it uses as much as digits as its factorization.

678586049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The square root of 678586049 is about 26049.6842399289. The cubic root of 678586049 is about 878.7560113225.

The spelling of 678586049 in words is "six hundred seventy-eight million, five hundred eighty-six thousand, forty-nine".