6660220 has 48 divisors (see below), whose sum is σ = 16164288. Its totient is φ = 2257920.

The previous prime is 6660217. The next prime is 6660221. The reversal of 6660220 is 220666.

It is a junction number, because it is equal to n+sod(n) for n = 6660191 and 6660200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660221) 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 15 ways as a sum of consecutive naturals, for example, 15610 + ... + 16030.

It is an arithmetic number, because the mean of its divisors is an integer number (336756).

Almost surely, 2^6660220 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 6660220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8082144).

6660220 is an abundant number, since it is smaller than the sum of its proper divisors (9504068).

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

6660220 is a wasteful number, since it uses less digits than its factorization.

6660220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 6660220 is about 2580.7402038950. The cubic root of 6660220 is about 188.1465207552.

Adding to 6660220 its reverse (220666), we get a palindrome (6880886).

The spelling of 6660220 in words is "six million, six hundred sixty thousand, two hundred twenty".