681703680 has 216 divisors, whose sum is σ = 2533349952. Its totient is φ = 155774976.

The previous prime is 681703669. The next prime is 681703697. The reversal of 681703680 is 86307186.

It is a zygodrome in base 14.

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 23 ways as a sum of consecutive naturals, for example, 186349 + ... + 189971.

It is an arithmetic number, because the mean of its divisors is an integer number (11728472).

Almost surely, 2^681703680 is an apocalyptic number.

681703680 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 681703680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1266674976).

681703680 is an abundant number, since it is smaller than the sum of its proper divisors (1851646272).

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

681703680 is a wasteful number, since it uses less digits than its factorization.

681703680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661 (or 3640 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 681703680 is about 26109.4557584029. The cubic root of 681703680 is about 880.0997132189.

The spelling of 681703680 in words is "six hundred eighty-one million, seven hundred three thousand, six hundred eighty".