685769031 has 32 divisors (see below), whose sum is σ = 1049312000. Its totient is φ = 442368864.

The previous prime is 685769009. The next prime is 685769041. The reversal of 685769031 is 130967586.

It is a happy number.

It is not a de Polignac number, because 685769031 - 2⁹ = 685768519 is a prime.

It is a super-2 number, since 2×685769031² = 940558327757357922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685769041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123840 + ... + 129258.

It is an arithmetic number, because the mean of its divisors is an integer number (32791000).

Almost surely, 2^685769031 is an apocalyptic number.

685769031 is a deficient number, since it is larger than the sum of its proper divisors (363542969).

685769031 is a wasteful number, since it uses less digits than its factorization.

685769031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580 (or 5574 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 685769031 is about 26187.1921175219. The cubic root of 685769031 is about 881.8457433039.

The spelling of 685769031 in words is "six hundred eighty-five million, seven hundred sixty-nine thousand, thirty-one".