685586879 has 2 divisors, whose sum is σ = 685586880. Its totient is φ = 685586878.

The previous prime is 685586833. The next prime is 685586929. The reversal of 685586879 is 978685586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685586879 - 2⁸ = 685586623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685586809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342793439 + 342793440.

It is an arithmetic number, because the mean of its divisors is an integer number (342793440).

Almost surely, 2^685586879 is an apocalyptic number.

685586879 is a deficient number, since it is larger than the sum of its proper divisors (1).

685586879 is an equidigital number, since it uses as much as digits as its factorization.

685586879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 62.

The square root of 685586879 is about 26183.7140031738. The cubic root of 685586879 is about 881.7676586122.

The spelling of 685586879 in words is "six hundred eighty-five million, five hundred eighty-six thousand, eight hundred seventy-nine".