678044293 has 2 divisors, whose sum is σ = 678044294. Its totient is φ = 678044292.

The previous prime is 678044267. The next prime is 678044357. The reversal of 678044293 is 392440876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426092164 + 251952129 = 20642^2 + 15873^2 .

It is a cyclic number.

It is not a de Polignac number, because 678044293 - 2⁹ = 678043781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678041293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339022146 + 339022147.

It is an arithmetic number, because the mean of its divisors is an integer number (339022147).

Almost surely, 2^678044293 is an apocalyptic number.

It is an amenable number.

678044293 is a deficient number, since it is larger than the sum of its proper divisors (1).

678044293 is an equidigital number, since it uses as much as digits as its factorization.

678044293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 678044293 is about 26039.2836499010. The cubic root of 678044293 is about 878.5220944937.

The spelling of 678044293 in words is "six hundred seventy-eight million, forty-four thousand, two hundred ninety-three".