678837889 has 2 divisors, whose sum is σ = 678837890. Its totient is φ = 678837888.

The previous prime is 678837823. The next prime is 678837899. The reversal of 678837889 is 988738876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 663938289 + 14899600 = 25767^2 + 3860^2 .

It is a cyclic number.

It is not a de Polignac number, because 678837889 - 2²¹ = 676740737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 678837889.

It is not a weakly prime, because it can be changed into another prime (678837899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339418944 + 339418945.

It is an arithmetic number, because the mean of its divisors is an integer number (339418945).

Almost surely, 2^678837889 is an apocalyptic number.

It is an amenable number.

678837889 is a deficient number, since it is larger than the sum of its proper divisors (1).

678837889 is an equidigital number, since it uses as much as digits as its factorization.

678837889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32514048, while the sum is 64.

The square root of 678837889 is about 26054.5176313053. The cubic root of 678837889 is about 878.8647072118.

The spelling of 678837889 in words is "six hundred seventy-eight million, eight hundred thirty-seven thousand, eight hundred eighty-nine".