663222 has 16 divisors (see below), whose sum is σ = 1516032. Its totient is φ = 189480.

The previous prime is 663209. The next prime is 663239. The reversal of 663222 is 222366.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7854 + ... + 7937.

It is an arithmetic number, because the mean of its divisors is an integer number (94752).

2⁶⁶³²²² is an apocalyptic number.

663222 is an abundant number, since it is smaller than the sum of its proper divisors (852810).

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

663222 is a wasteful number, since it uses less digits than its factorization.

663222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15803.

The product of its digits is 864, while the sum is 21.

The square root of 663222 is about 814.3844301066. The cubic root of 663222 is about 87.2073269101.

Adding to 663222 its reverse (222366), we get a palindrome (885588).

The spelling of 663222 in words is "six hundred sixty-three thousand, two hundred twenty-two".