678344477 has 2 divisors, whose sum is σ = 678344478. Its totient is φ = 678344476.

The previous prime is 678344453. The next prime is 678344503. The reversal of 678344477 is 774443876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376592836 + 301751641 = 19406^2 + 17371^2 .

It is a cyclic number.

It is not a de Polignac number, because 678344477 - 2⁶ = 678344413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678844477) 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, 339172238 + 339172239.

It is an arithmetic number, because the mean of its divisors is an integer number (339172239).

Almost surely, 2^678344477 is an apocalyptic number.

It is an amenable number.

678344477 is a deficient number, since it is larger than the sum of its proper divisors (1).

678344477 is an equidigital number, since it uses as much as digits as its factorization.

678344477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3161088, while the sum is 50.

The square root of 678344477 is about 26045.0470723322. The cubic root of 678344477 is about 878.6517218995.

The spelling of 678344477 in words is "six hundred seventy-eight million, three hundred forty-four thousand, four hundred seventy-seven".