678049397 has 2 divisors, whose sum is σ = 678049398. Its totient is φ = 678049396.

The previous prime is 678049387. The next prime is 678049399. The reversal of 678049397 is 793940876.

678049397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 462723121 + 215326276 = 21511^2 + 14674^2 .

It is a cyclic number.

It is not a de Polignac number, because 678049397 - 2¹⁰ = 678048373 is a prime.

Together with 678049399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678049399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339024698 + 339024699.

It is an arithmetic number, because the mean of its divisors is an integer number (339024699).

Almost surely, 2^678049397 is an apocalyptic number.

It is an amenable number.

678049397 is a deficient number, since it is larger than the sum of its proper divisors (1).

678049397 is an equidigital number, since it uses as much as digits as its factorization.

678049397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 678049397 is about 26039.3816554848. The cubic root of 678049397 is about 878.5242988558.

The spelling of 678049397 in words is "six hundred seventy-eight million, forty-nine thousand, three hundred ninety-seven".