681538834 has 8 divisors (see below), whose sum is σ = 1022430780. Its totient is φ = 340728576.

The previous prime is 681538799. The next prime is 681538841. The reversal of 681538834 is 438835186.

681538834 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 2 ways, for example, as 681366609 + 172225 = 26103^2 + 415^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8802 + ... + 37954.

Almost surely, 2^681538834 is an apocalyptic number.

681538834 is a deficient number, since it is larger than the sum of its proper divisors (340891946).

681538834 is a wasteful number, since it uses less digits than its factorization.

681538834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40844.

The product of its digits is 552960, while the sum is 46.

The square root of 681538834 is about 26106.2987418745. The cubic root of 681538834 is about 880.0287671381.

The spelling of 681538834 in words is "six hundred eighty-one million, five hundred thirty-eight thousand, eight hundred thirty-four".