686320768 has 32 divisors (see below), whose sum is σ = 1562607360. Its totient is φ = 294137088.

The previous prime is 686320751. The next prime is 686320783. The reversal of 686320768 is 867023686.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382096 + ... + 383887.

It is an arithmetic number, because the mean of its divisors is an integer number (48831480).

Almost surely, 2^686320768 is an apocalyptic number.

It is an amenable number.

686320768 is an abundant number, since it is smaller than the sum of its proper divisors (876286592).

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

686320768 is an equidigital number, since it uses as much as digits as its factorization.

686320768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766004 (or 765992 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 686320768 is about 26197.7244813362. The cubic root of 686320768 is about 882.0821768926.

The spelling of 686320768 in words is "six hundred eighty-six million, three hundred twenty thousand, seven hundred sixty-eight".