6866645 has 8 divisors (see below), whose sum is σ = 8462904. Its totient is φ = 5344704.

The previous prime is 6866633. The next prime is 6866647. The reversal of 6866645 is 5466686.

It can be written as a sum of positive squares in 4 ways, for example, as 2140369 + 4726276 = 1463^2 + 2174^2 .

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 6866645 - 2⁸ = 6866389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6866647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18374 + ... + 18743.

It is an arithmetic number, because the mean of its divisors is an integer number (1057863).

Almost surely, 2^6866645 is an apocalyptic number.

It is an amenable number.

6866645 is a deficient number, since it is larger than the sum of its proper divisors (1596259).

6866645 is a wasteful number, since it uses less digits than its factorization.

6866645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37159.

The product of its digits is 207360, while the sum is 41.

The square root of 6866645 is about 2620.4284000903. The cubic root of 6866645 is about 190.0705647405.

Adding to 6866645 its sum of digits (41), we get a palindrome (6866686).

The spelling of 6866645 in words is "six million, eight hundred sixty-six thousand, six hundred forty-five".