678083849 has 2 divisors, whose sum is σ = 678083850. Its totient is φ = 678083848.

The previous prime is 678083803. The next prime is 678083851. The reversal of 678083849 is 948380876.

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., 491952400 + 186131449 = 22180^2 + 13643^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678083849 is a prime.

Together with 678083851, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 678083849.

It is not a weakly prime, because it can be changed into another prime (678088849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339041924 + 339041925.

It is an arithmetic number, because the mean of its divisors is an integer number (339041925).

Almost surely, 2^678083849 is an apocalyptic number.

It is an amenable number.

678083849 is a deficient number, since it is larger than the sum of its proper divisors (1).

678083849 is an equidigital number, since it uses as much as digits as its factorization.

678083849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The square root of 678083849 is about 26040.0431835279. The cubic root of 678083849 is about 878.5391780110.

The spelling of 678083849 in words is "six hundred seventy-eight million, eighty-three thousand, eight hundred forty-nine".