664422 has 16 divisors (see below), whose sum is σ = 1449792. Its totient is φ = 201320.

The previous prime is 664421. The next prime is 664427. The reversal of 664422 is 224466.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6 + 6⁵ + 4⁴ + 4⁵ + 2¹⁷ + 2¹⁹ .

It is a plaindrome in base 9.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 664392 and 664401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4968 + ... + 5099.

It is an arithmetic number, because the mean of its divisors is an integer number (90612).

2⁶⁶⁴⁴²² is an apocalyptic number.

664422 is an abundant number, since it is smaller than the sum of its proper divisors (785370).

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

664422 is a wasteful number, since it uses less digits than its factorization.

664422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10083.

The product of its digits is 2304, while the sum is 24.

The square root of 664422 is about 815.1208499358. The cubic root of 664422 is about 87.2598913808.

Adding to 664422 its reverse (224466), we get a palindrome (888888).

It can be divided in two parts, 6644 and 22, that added together give a palindrome (6666).

The spelling of 664422 in words is "six hundred sixty-four thousand, four hundred twenty-two".