664222 has 16 divisors (see below), whose sum is σ = 1093680. Its totient is φ = 300672.

The previous prime is 664211. The next prime is 664243. The reversal of 664222 is 222466.

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 = 664193 and 664202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1318 + ... + 1750.

It is an arithmetic number, because the mean of its divisors is an integer number (68355).

2⁶⁶⁴²²² is an apocalyptic number.

664222 is a deficient number, since it is larger than the sum of its proper divisors (429458).

664222 is a wasteful number, since it uses less digits than its factorization.

664222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507.

The product of its digits is 1152, while the sum is 22.

The square root of 664222 is about 814.9981595071. The cubic root of 664222 is about 87.2511350334.

Adding to 664222 its reverse (222466), we get a palindrome (886688).

The spelling of 664222 in words is "six hundred sixty-four thousand, two hundred twenty-two".