685727587 has 2 divisors, whose sum is σ = 685727588. Its totient is φ = 685727586.

The previous prime is 685727569. The next prime is 685727593. The reversal of 685727587 is 785727586.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685727587 - 2⁷ = 685727459 is a prime.

It is a super-3 number, since 3×685727587³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (685725587) 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, 342863793 + 342863794.

It is an arithmetic number, because the mean of its divisors is an integer number (342863794).

Almost surely, 2^685727587 is an apocalyptic number.

685727587 is a deficient number, since it is larger than the sum of its proper divisors (1).

685727587 is an equidigital number, since it uses as much as digits as its factorization.

685727587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6585600, while the sum is 55.

The square root of 685727587 is about 26186.4008027067. The cubic root of 685727587 is about 881.8279783570.

Subtracting 685727587 from its reverse (785727586), we obtain a palindrome (99999999).

The spelling of 685727587 in words is "six hundred eighty-five million, seven hundred twenty-seven thousand, five hundred eighty-seven".