681605682 has 16 divisors (see below), whose sum is σ = 1373020320. Its totient is φ = 225567072.

The previous prime is 681605681. The next prime is 681605719. The reversal of 681605682 is 286506186.

It is not an unprimeable number, because it can be changed into a prime (681605681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407803 + ... + 409470.

It is an arithmetic number, because the mean of its divisors is an integer number (85813770).

Almost surely, 2^681605682 is an apocalyptic number.

681605682 is an abundant number, since it is smaller than the sum of its proper divisors (691414638).

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

681605682 is a wasteful number, since it uses less digits than its factorization.

681605682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817417.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 681605682 is about 26107.5790145314. The cubic root of 681605682 is about 880.0575384210.

The spelling of 681605682 in words is "six hundred eighty-one million, six hundred five thousand, six hundred eighty-two".