678586949 has 2 divisors, whose sum is σ = 678586950. Its totient is φ = 678586948.

The previous prime is 678586891. The next prime is 678587003. The reversal of 678586949 is 949685876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509404900 + 169182049 = 22570^2 + 13007^2 .

It is a cyclic number.

It is not a de Polignac number, because 678586949 - 2²⁰ = 677538373 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 678586891 and 678586900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678586049) 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, 339293474 + 339293475.

It is an arithmetic number, because the mean of its divisors is an integer number (339293475).

Almost surely, 2^678586949 is an apocalyptic number.

It is an amenable number.

678586949 is a deficient number, since it is larger than the sum of its proper divisors (1).

678586949 is an equidigital number, since it uses as much as digits as its factorization.

678586949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 62.

The square root of 678586949 is about 26049.7015146047. The cubic root of 678586949 is about 878.7563998166.

The spelling of 678586949 in words is "six hundred seventy-eight million, five hundred eighty-six thousand, nine hundred forty-nine".