678360989 has 2 divisors, whose sum is σ = 678360990. Its totient is φ = 678360988.

The previous prime is 678360929. The next prime is 678361001. The reversal of 678360989 is 989063876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 383964025 + 294396964 = 19595^2 + 17158^2 .

It is a cyclic number.

It is not a de Polignac number, because 678360989 - 2²⁸ = 409925533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678360929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339180494 + 339180495.

It is an arithmetic number, because the mean of its divisors is an integer number (339180495).

Almost surely, 2^678360989 is an apocalyptic number.

It is an amenable number.

678360989 is a deficient number, since it is larger than the sum of its proper divisors (1).

678360989 is an equidigital number, since it uses as much as digits as its factorization.

678360989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 678360989 is about 26045.3640596556. The cubic root of 678360989 is about 878.6588511089.

The spelling of 678360989 in words is "six hundred seventy-eight million, three hundred sixty thousand, nine hundred eighty-nine".