6666220 has 48 divisors (see below), whose sum is σ = 15448608. Its totient is φ = 2396160.

The previous prime is 6666203. The next prime is 6666223. The reversal of 6666220 is 226666.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6666223) 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, 34444 + ... + 34636.

It is an arithmetic number, because the mean of its divisors is an integer number (321846).

Almost surely, 2^6666220 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 6666220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7724304).

6666220 is an abundant number, since it is smaller than the sum of its proper divisors (8782388).

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

6666220 is a wasteful number, since it uses less digits than its factorization.

6666220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 6666220 is about 2581.9023993947. The cubic root of 6666220 is about 188.2030023881.

It can be divided in two parts, 6666 and 220, that added together give a palindrome (6886).

The spelling of 6666220 in words is "six million, six hundred sixty-six thousand, two hundred twenty".