678767689 has 2 divisors, whose sum is σ = 678767690. Its totient is φ = 678767688.

The previous prime is 678767633. The next prime is 678767699. The reversal of 678767689 is 986767876.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384473664 + 294294025 = 19608^2 + 17155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678767689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 678767689.

It is not a weakly prime, because it can be changed into another prime (678767699) 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, 339383844 + 339383845.

It is an arithmetic number, because the mean of its divisors is an integer number (339383845).

Almost surely, 2^678767689 is an apocalyptic number.

It is an amenable number.

678767689 is a deficient number, since it is larger than the sum of its proper divisors (1).

678767689 is an equidigital number, since it uses as much as digits as its factorization.

678767689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42674688, while the sum is 64.

The square root of 678767689 is about 26053.1704212750. The cubic root of 678767689 is about 878.8344111081.

The spelling of 678767689 in words is "six hundred seventy-eight million, seven hundred sixty-seven thousand, six hundred eighty-nine".