686949856320 has 896 divisors, whose sum is σ = 2790216253440. Its totient is φ = 139273666560.

The previous prime is 686949856303. The next prime is 686949856339. The reversal of 686949856320 is 23658949686.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 666294205 + ... + 666295235.

It is an arithmetic number, because the mean of its divisors is an integer number (3114080640).

Almost surely, 2^686949856320 is an apocalyptic number.

686949856320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686949856320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1395108126720).

686949856320 is an abundant number, since it is smaller than the sum of its proper divisors (2103266397120).

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

686949856320 is a wasteful number, since it uses less digits than its factorization.

686949856320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363 (or 1353 counting only the distinct ones).

The product of its (nonzero) digits is 134369280, while the sum is 66.

The spelling of 686949856320 in words is "six hundred eighty-six billion, nine hundred forty-nine million, eight hundred fifty-six thousand, three hundred twenty".