681945936 has 240 divisors, whose sum is σ = 2171289600. Its totient is φ = 183617280.

The previous prime is 681945919. The next prime is 681945941. The reversal of 681945936 is 639549186.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 3426765 + ... + 3426963.

It is an arithmetic number, because the mean of its divisors is an integer number (9047040).

Almost surely, 2^681945936 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 681945936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1085644800).

681945936 is an abundant number, since it is smaller than the sum of its proper divisors (1489343664).

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

681945936 is a wasteful number, since it uses less digits than its factorization.

681945936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 289 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 51.

The square root of 681945936 is about 26114.0945851086. The cubic root of 681945936 is about 880.2039541041.

The spelling of 681945936 in words is "six hundred eighty-one million, nine hundred forty-five thousand, nine hundred thirty-six".