6816644 has 6 divisors (see below), whose sum is σ = 11929134. Its totient is φ = 3408320.

The previous prime is 6816631. The next prime is 6816659. The reversal of 6816644 is 4466186.

It can be written as a sum of positive squares in only one way, i.e., 6760000 + 56644 = 2600^2 + 238^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 852077 + ... + 852084.

It is an arithmetic number, because the mean of its divisors is an integer number (1988189).

Almost surely, 2^6816644 is an apocalyptic number.

It is an amenable number.

6816644 is a deficient number, since it is larger than the sum of its proper divisors (5112490).

6816644 is a wasteful number, since it uses less digits than its factorization.

6816644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704165 (or 1704163 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 6816644 is about 2610.8703529666. The cubic root of 6816644 is about 189.6080933836.

The spelling of 6816644 in words is "six million, eight hundred sixteen thousand, six hundred forty-four".