681641000 has 64 divisors (see below), whose sum is σ = 1629089280. Its totient is φ = 266836800.

The previous prime is 681640987. The next prime is 681641011. The reversal of 681641000 is 146186.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39749 + ... + 54251.

It is an arithmetic number, because the mean of its divisors is an integer number (25454520).

Almost surely, 2^681641000 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 681641000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (814544640).

681641000 is an abundant number, since it is smaller than the sum of its proper divisors (947448280).

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

681641000 is a wasteful number, since it uses less digits than its factorization.

681641000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14571 (or 14557 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 681641000 is about 26108.2553993943. The cubic root of 681641000 is about 880.0727384778.

Adding to 681641000 its reverse (146186), we get a palindrome (681787186).

The spelling of 681641000 in words is "six hundred eighty-one million, six hundred forty-one thousand".