3660220 has 48 divisors (see below), whose sum is σ = 8205120. Its totient is φ = 1368576.

The previous prime is 3660211. The next prime is 3660221. The reversal of 3660220 is 220663.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3660221) 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, 33526 + ... + 33634.

It is an arithmetic number, because the mean of its divisors is an integer number (170940).

Almost surely, 2^3660220 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 3660220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4102560).

3660220 is an abundant number, since it is smaller than the sum of its proper divisors (4544900).

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

3660220 is a wasteful number, since it uses less digits than its factorization.

3660220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 3660220 is about 1913.1701440280. The cubic root of 3660220 is about 154.1117421422. Note that the first 3 decimals are identical.

Adding to 3660220 its reverse (220663), we get a palindrome (3880883).

The spelling of 3660220 in words is "three million, six hundred sixty thousand, two hundred twenty".