681744805 has 8 divisors (see below), whose sum is σ = 934964352. Its totient is φ = 467482128.

The previous prime is 681744803. The next prime is 681744857. The reversal of 681744805 is 508447186.

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

It is a cyclic number.

It is not a de Polignac number, because 681744805 - 2¹ = 681744803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681744803) 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, 9739177 + ... + 9739246.

It is an arithmetic number, because the mean of its divisors is an integer number (116870544).

Almost surely, 2^681744805 is an apocalyptic number.

It is an amenable number.

681744805 is a deficient number, since it is larger than the sum of its proper divisors (253219547).

681744805 is a wasteful number, since it uses less digits than its factorization.

681744805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19478435.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 681744805 is about 26110.2432964536. The cubic root of 681744805 is about 880.1174107288.

The spelling of 681744805 in words is "six hundred eighty-one million, seven hundred forty-four thousand, eight hundred five".