681839826 has 16 divisors (see below), whose sum is σ = 1368040224. Its totient is φ = 226553184.

The previous prime is 681839803. The next prime is 681839839. The reversal of 681839826 is 628938186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179656 + ... + 183411.

It is an arithmetic number, because the mean of its divisors is an integer number (85502514).

Almost surely, 2^681839826 is an apocalyptic number.

681839826 is an abundant number, since it is smaller than the sum of its proper divisors (686200398).

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

681839826 is a wasteful number, since it uses less digits than its factorization.

681839826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363385.

The product of its digits is 995328, while the sum is 51.

The square root of 681839826 is about 26112.0628445935. The cubic root of 681839826 is about 880.1582988299.

The spelling of 681839826 in words is "six hundred eighty-one million, eight hundred thirty-nine thousand, eight hundred twenty-six".