6820816 has 10 divisors (see below), whose sum is σ = 13215362. Its totient is φ = 3410400.

The previous prime is 6820783. The next prime is 6820817. The reversal of 6820816 is 6180286.

It can be written as a sum of positive squares in only one way, i.e., 6780816 + 40000 = 2604^2 + 200^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6820817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213135 + ... + 213166.

Almost surely, 2^6820816 is an apocalyptic number.

It is an amenable number.

6820816 is a deficient number, since it is larger than the sum of its proper divisors (6394546).

6820816 is a wasteful number, since it uses less digits than its factorization.

6820816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426309 (or 426303 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 6820816 is about 2611.6691980417. The cubic root of 6820816 is about 189.6467675287.

The spelling of 6820816 in words is "six million, eight hundred twenty thousand, eight hundred sixteen".