681963800 has 96 divisors (see below), whose sum is σ = 1890950400. Its totient is φ = 223639680.

The previous prime is 681963791. The next prime is 681963803. The reversal of 681963800 is 8369186.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681963803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21611 + ... + 42789.

It is an arithmetic number, because the mean of its divisors is an integer number (19697400).

Almost surely, 2^681963800 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 681963800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945475200).

681963800 is an abundant number, since it is smaller than the sum of its proper divisors (1208986600).

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

681963800 is a wasteful number, since it uses less digits than its factorization.

681963800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21225 (or 21216 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 681963800 is about 26114.4366203830. The cubic root of 681963800 is about 880.2116398679.

The spelling of 681963800 in words is "six hundred eighty-one million, nine hundred sixty-three thousand, eight hundred".