681839727 has 8 divisors (see below), whose sum is σ = 909492864. Its totient is φ = 454373208.

The previous prime is 681839713. The next prime is 681839731. The reversal of 681839727 is 727938186.

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

It is not a de Polignac number, because 681839727 - 2¹² = 681835631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681839727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681839747) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 37893 + ... + 52910.

It is an arithmetic number, because the mean of its divisors is an integer number (113686608).

Almost surely, 2^681839727 is an apocalyptic number.

681839727 is a deficient number, since it is larger than the sum of its proper divisors (227653137).

681839727 is a wasteful number, since it uses less digits than its factorization.

681839727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93309.

The product of its digits is 1016064, while the sum is 51.

The square root of 681839727 is about 26112.0609489178. The cubic root of 681839727 is about 880.1582562316.

The spelling of 681839727 in words is "six hundred eighty-one million, eight hundred thirty-nine thousand, seven hundred twenty-seven".