6442220 has 12 divisors (see below), whose sum is σ = 13528704. Its totient is φ = 2576880.

The previous prime is 6442169. The next prime is 6442223. The reversal of 6442220 is 222446.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 322111 = 6442220 / (6 + 4 + 4 + 2 + 2 + 2 + 0).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6442192 and 6442201.

It is not an unprimeable number, because it can be changed into a prime (6442223) 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 3 ways as a sum of consecutive naturals, for example, 161036 + ... + 161075.

It is an arithmetic number, because the mean of its divisors is an integer number (1127392).

Almost surely, 2^6442220 is an apocalyptic number.

It is an amenable number.

6442220 is an abundant number, since it is smaller than the sum of its proper divisors (7086484).

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

6442220 is a wasteful number, since it uses less digits than its factorization.

6442220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322120 (or 322118 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 6442220 is about 2538.1528716766. The cubic root of 6442220 is about 186.0709252773.

Adding to 6442220 its reverse (222446), we get a palindrome (6664666).

The spelling of 6442220 in words is "six million, four hundred forty-two thousand, two hundred twenty".