6811820 has 12 divisors (see below), whose sum is σ = 14304864. Its totient is φ = 2724720.

The previous prime is 6811813. The next prime is 6811829. The reversal of 6811820 is 281186.

It is a self number, because there is not a number n which added to its sum of digits gives 6811820.

It is not an unprimeable number, because it can be changed into a prime (6811829) 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 3 ways as a sum of consecutive naturals, for example, 170276 + ... + 170315.

It is an arithmetic number, because the mean of its divisors is an integer number (1192072).

Almost surely, 2^6811820 is an apocalyptic number.

It is an amenable number.

6811820 is an abundant number, since it is smaller than the sum of its proper divisors (7493044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6811820 is a wasteful number, since it uses less digits than its factorization.

6811820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340600 (or 340598 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 6811820 is about 2609.9463596021. The cubic root of 6811820 is about 189.5633555677.

The spelling of 6811820 in words is "six million, eight hundred eleven thousand, eight hundred twenty".