678597889 has 2 divisors, whose sum is σ = 678597890. Its totient is φ = 678597888.

The previous prime is 678597817. The next prime is 678597893. The reversal of 678597889 is 988795876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531994225 + 146603664 = 23065^2 + 12108^2 .

It is a cyclic number.

It is not a de Polignac number, because 678597889 - 2¹⁹ = 678073601 is a prime.

It is not a weakly prime, because it can be changed into another prime (678597809) 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, 339298944 + 339298945.

It is an arithmetic number, because the mean of its divisors is an integer number (339298945).

Almost surely, 2^678597889 is an apocalyptic number.

It is an amenable number.

678597889 is a deficient number, since it is larger than the sum of its proper divisors (1).

678597889 is an equidigital number, since it uses as much as digits as its factorization.

678597889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 67.

The square root of 678597889 is about 26049.9114969706. The cubic root of 678597889 is about 878.7611221509.

The spelling of 678597889 in words is "six hundred seventy-eight million, five hundred ninety-seven thousand, eight hundred eighty-nine".