678779 has 2 divisors, whose sum is σ = 678780. Its totient is φ = 678778.

The previous prime is 678773. The next prime is 678809. The reversal of 678779 is 977876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678779 - 2⁴ = 678763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (678773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339389 + 339390.

It is an arithmetic number, because the mean of its divisors is an integer number (339390).

2⁶⁷⁸⁷⁷⁹ is an apocalyptic number.

678779 is a deficient number, since it is larger than the sum of its proper divisors (1).

678779 is an equidigital number, since it uses as much as digits as its factorization.

678779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 44.

The square root of 678779 is about 823.8804524930. The cubic root of 678779 is about 87.8839292720.

The spelling of 678779 in words is "six hundred seventy-eight thousand, seven hundred seventy-nine".