686865312 has 144 divisors (see below), whose sum is σ = 2296365120. Its totient is φ = 195664896.

The previous prime is 686865259. The next prime is 686865313. The reversal of 686865312 is 213568686.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (686865313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2038008 + ... + 2038344.

It is an arithmetic number, because the mean of its divisors is an integer number (15946980).

Almost surely, 2^686865312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686865312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1148182560).

686865312 is an abundant number, since it is smaller than the sum of its proper divisors (1609499808).

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

686865312 is an equidigital number, since it uses as much as digits as its factorization.

686865312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700 (or 349 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 686865312 is about 26208.1153843614. The cubic root of 686865312 is about 882.3154038807.

The spelling of 686865312 in words is "six hundred eighty-six million, eight hundred sixty-five thousand, three hundred twelve".