678244213 has 2 divisors, whose sum is σ = 678244214. Its totient is φ = 678244212.

The previous prime is 678244207. The next prime is 678244243. The reversal of 678244213 is 312442876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616181329 + 62062884 = 24823^2 + 7878^2 .

It is a cyclic number.

It is not a de Polignac number, because 678244213 - 2²¹ = 676147061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678244243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339122106 + 339122107.

It is an arithmetic number, because the mean of its divisors is an integer number (339122107).

Almost surely, 2^678244213 is an apocalyptic number.

It is an amenable number.

678244213 is a deficient number, since it is larger than the sum of its proper divisors (1).

678244213 is an equidigital number, since it uses as much as digits as its factorization.

678244213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 37.

The square root of 678244213 is about 26043.1221822576. The cubic root of 678244213 is about 878.6084295016.

The spelling of 678244213 in words is "six hundred seventy-eight million, two hundred forty-four thousand, two hundred thirteen".