677779 has 2 divisors, whose sum is σ = 677780. Its totient is φ = 677778.

The previous prime is 677767. The next prime is 677783. The reversal of 677779 is 977776.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 677779 - 2¹⁵ = 645011 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (671779) 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, 338889 + 338890.

It is an arithmetic number, because the mean of its divisors is an integer number (338890).

2⁶⁷⁷⁷⁷⁹ is an apocalyptic number.

677779 is a deficient number, since it is larger than the sum of its proper divisors (1).

677779 is an equidigital number, since it uses as much as digits as its factorization.

677779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129654, while the sum is 43.

The square root of 677779 is about 823.2733446432. The cubic root of 677779 is about 87.8407502095.

The spelling of 677779 in words is "six hundred seventy-seven thousand, seven hundred seventy-nine".