678563689 has 4 divisors (see below), whose sum is σ = 687859156. Its totient is φ = 669268224.

The previous prime is 678563671. The next prime is 678563707. The reversal of 678563689 is 986365876.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (678563671) and next prime (678563707).

It can be written as a sum of positive squares in 2 ways, for example, as 306845289 + 371718400 = 17517^2 + 19280^2 .

It is a cyclic number.

It is not a de Polignac number, because 678563689 - 2⁵ = 678563657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678563629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4647624 + ... + 4647769.

It is an arithmetic number, because the mean of its divisors is an integer number (171964789).

Almost surely, 2^678563689 is an apocalyptic number.

It is an amenable number.

678563689 is a deficient number, since it is larger than the sum of its proper divisors (9295467).

678563689 is an equidigital number, since it uses as much as digits as its factorization.

678563689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9295466.

The product of its digits is 13063680, while the sum is 58.

The square root of 678563689 is about 26049.2550565270. The cubic root of 678563689 is about 878.7463592917.

The spelling of 678563689 in words is "six hundred seventy-eight million, five hundred sixty-three thousand, six hundred eighty-nine".