685000685 has 16 divisors (see below), whose sum is σ = 836283312. Its totient is φ = 538560000.

The previous prime is 685000663. The next prime is 685000709. The reversal of 685000685 is 586000586.

It can be written as a sum of positive squares in 8 ways, for example, as 192071881 + 492928804 = 13859^2 + 22202^2 .

It is not a de Polignac number, because 685000685 - 2¹⁴ = 684984301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64235 + ... + 74135.

It is an arithmetic number, because the mean of its divisors is an integer number (52267707).

Almost surely, 2^685000685 is an apocalyptic number.

It is an amenable number.

685000685 is a deficient number, since it is larger than the sum of its proper divisors (151282627).

685000685 is a wasteful number, since it uses less digits than its factorization.

685000685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10144.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 685000685 is about 26172.5177428539. The cubic root of 685000685 is about 881.5162757879.

Subtracting from 685000685 its reverse (586000586), we obtain a palindrome (99000099).

The spelling of 685000685 in words is "six hundred eighty-five million, six hundred eighty-five", and thus it is an aban number.