681400008 has 96 divisors (see below), whose sum is σ = 1917115200. Its totient is φ = 218381184.

The previous prime is 681399997. The next prime is 681400039. The reversal of 681400008 is 800004186.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 640485 + ... + 641547.

It is an arithmetic number, because the mean of its divisors is an integer number (19969950).

Almost surely, 2^681400008 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 681400008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958557600).

681400008 is an abundant number, since it is smaller than the sum of its proper divisors (1235715192).

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

681400008 is a wasteful number, since it uses less digits than its factorization.

681400008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411 (or 1404 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 681400008 is about 26103.6397462116. The cubic root of 681400008 is about 879.9690106167.

It can be divided in two parts, 681 and 400008, that added together give a square (400689 = 633²).

The spelling of 681400008 in words is "six hundred eighty-one million, four hundred thousand, eight".