8006681 has 4 divisors (see below), whose sum is σ = 8019252. Its totient is φ = 7994112.

The previous prime is 8006651. The next prime is 8006683. The reversal of 8006681 is 1866008.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6046681 + 1960000 = 2459^2 + 1400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8006681 is a prime.

It is a super-2 number, since 2×8006681² = 128213881271522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8006683) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5276 + ... + 6621.

It is an arithmetic number, because the mean of its divisors is an integer number (2004813).

Almost surely, 2^8006681 is an apocalyptic number.

It is an amenable number.

8006681 is a deficient number, since it is larger than the sum of its proper divisors (12571).

8006681 is a wasteful number, since it uses less digits than its factorization.

8006681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12570.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 8006681 is about 2829.6079233703. The cubic root of 8006681 is about 200.0556595087.

The spelling of 8006681 in words is "eight million, six thousand, six hundred eighty-one".