681944200 has 192 divisors, whose sum is σ = 1971302400. Its totient is φ = 214099200.

The previous prime is 681944191. The next prime is 681944201. The reversal of 681944200 is 2449186.

It is not an unprimeable number, because it can be changed into a prime (681944201) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 824187 + ... + 825013.

It is an arithmetic number, because the mean of its divisors is an integer number (10267200).

Almost surely, 2^681944200 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 681944200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985651200).

681944200 is an abundant number, since it is smaller than the sum of its proper divisors (1289358200).

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

681944200 is a wasteful number, since it uses less digits than its factorization.

681944200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900 (or 891 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 681944200 is about 26114.0613463322. The cubic root of 681944200 is about 880.2032072046.

The spelling of 681944200 in words is "six hundred eighty-one million, nine hundred forty-four thousand, two hundred".