685809260 has 12 divisors (see below), whose sum is σ = 1440199488. Its totient is φ = 274323696.

The previous prime is 685809247. The next prime is 685809263. The reversal of 685809260 is 62908586.

It is a happy number.

It is a super-2 number, since 2×685809260² = 940668682203495200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (685809263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17145212 + ... + 17145251.

It is an arithmetic number, because the mean of its divisors is an integer number (120016624).

Almost surely, 2^685809260 is an apocalyptic number.

It is an amenable number.

685809260 is an abundant number, since it is smaller than the sum of its proper divisors (754390228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685809260 is a wasteful number, since it uses less digits than its factorization.

685809260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34290472 (or 34290470 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 685809260 is about 26187.9602107533. The cubic root of 685809260 is about 881.8629867571.

The spelling of 685809260 in words is "six hundred eighty-five million, eight hundred nine thousand, two hundred sixty".