678381679 has 2 divisors, whose sum is σ = 678381680. Its totient is φ = 678381678.

The previous prime is 678381661. The next prime is 678381707. The reversal of 678381679 is 976183876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678381679 - 2⁷ = 678381551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678381629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339190839 + 339190840.

It is an arithmetic number, because the mean of its divisors is an integer number (339190840).

Almost surely, 2^678381679 is an apocalyptic number.

678381679 is a deficient number, since it is larger than the sum of its proper divisors (1).

678381679 is an equidigital number, since it uses as much as digits as its factorization.

678381679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The square root of 678381679 is about 26045.7612482338. The cubic root of 678381679 is about 878.6677840453.

The spelling of 678381679 in words is "six hundred seventy-eight million, three hundred eighty-one thousand, six hundred seventy-nine".