6543820 has 36 divisors (see below), whose sum is σ = 14182560. Its totient is φ = 2536128.

The previous prime is 6543787. The next prime is 6543833. The reversal of 6543820 is 283456.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 27261 + ... + 27499.

It is an arithmetic number, because the mean of its divisors is an integer number (393960).

Almost surely, 2^6543820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6543820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7091280).

6543820 is an abundant number, since it is smaller than the sum of its proper divisors (7638740).

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

6543820 is a wasteful number, since it uses less digits than its factorization.

6543820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 6543820 is about 2558.0891305817. The cubic root of 6543820 is about 187.0440000554.

The spelling of 6543820 in words is "six million, five hundred forty-three thousand, eight hundred twenty".