685497757 has 12 divisors (see below), whose sum is σ = 786772000. Its totient is φ = 585068328.

The previous prime is 685497733. The next prime is 685497833. The reversal of 685497757 is 757794586.

It is not a de Polignac number, because 685497757 - 2²³ = 677109149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685407757) 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 in 11 ways as a sum of consecutive naturals, for example, 1373494 + ... + 1373992.

Almost surely, 2^685497757 is an apocalyptic number.

It is an amenable number.

685497757 is a deficient number, since it is larger than the sum of its proper divisors (101274243).

685497757 is an frugal number, since it uses more digits than its factorization.

685497757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392 (or 949 counting only the distinct ones).

The product of its digits is 14817600, while the sum is 58.

The square root of 685497757 is about 26182.0120884549. The cubic root of 685497757 is about 881.7294488657.

The spelling of 685497757 in words is "six hundred eighty-five million, four hundred ninety-seven thousand, seven hundred fifty-seven".