681897682 has 16 divisors (see below), whose sum is σ = 1043069400. Its totient is φ = 334219392.

The previous prime is 681897673. The next prime is 681897683. The reversal of 681897682 is 286798186.

681897682 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 399960001 + 281937681 = 19999^2 + 16791^2 .

It is not an unprimeable number, because it can be changed into a prime (681897683) 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, 162118 + ... + 166270.

Almost surely, 2^681897682 is an apocalyptic number.

681897682 is a deficient number, since it is larger than the sum of its proper divisors (361171718).

681897682 is a wasteful number, since it uses less digits than its factorization.

681897682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5757.

The product of its digits is 2322432, while the sum is 55.

The square root of 681897682 is about 26113.1706615646. The cubic root of 681897682 is about 880.1831927499.

The spelling of 681897682 in words is "six hundred eighty-one million, eight hundred ninety-seven thousand, six hundred eighty-two".