6543220 has 48 divisors (see below), whose sum is σ = 14736960. Its totient is φ = 2433024.

The previous prime is 6543203. The next prime is 6543223. The reversal of 6543220 is 223456.

It is a happy number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6543191 and 6543200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25332 + ... + 25588.

It is an arithmetic number, because the mean of its divisors is an integer number (307020).

Almost surely, 2^6543220 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 6543220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7368480).

6543220 is an abundant number, since it is smaller than the sum of its proper divisors (8193740).

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

6543220 is a wasteful number, since it uses less digits than its factorization.

6543220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 6543220 is about 2557.9718528553. The cubic root of 6543220 is about 187.0382832198.

Adding to 6543220 its reverse (223456), we get a palindrome (6766676).

The spelling of 6543220 in words is "six million, five hundred forty-three thousand, two hundred twenty".