6720820 has 12 divisors (see below), whose sum is σ = 14113764. Its totient is φ = 2688320.

The previous prime is 6720817. The next prime is 6720821. The reversal of 6720820 is 280276.

It can be written as a sum of positive squares in 2 ways, for example, as 4343056 + 2377764 = 2084^2 + 1542^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720821) 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, 168001 + ... + 168040.

It is an arithmetic number, because the mean of its divisors is an integer number (1176147).

Almost surely, 2^6720820 is an apocalyptic number.

It is an amenable number.

6720820 is an abundant number, since it is smaller than the sum of its proper divisors (7392944).

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

6720820 is a wasteful number, since it uses less digits than its factorization.

6720820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336050 (or 336048 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 6720820 is about 2592.4544354723. The cubic root of 6720820 is about 188.7154345137.

The spelling of 6720820 in words is "six million, seven hundred twenty thousand, eight hundred twenty".