664621422 has 8 divisors (see below), whose sum is σ = 1329242856. Its totient is φ = 221540472.

The previous prime is 664621403. The next prime is 664621429. The reversal of 664621422 is 224126466.

It is a sphenic number, since it is the product of 3 distinct primes.

664621422 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664621429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55385113 + ... + 55385124.

It is an arithmetic number, because the mean of its divisors is an integer number (166155357).

Almost surely, 2^664621422 is an apocalyptic number.

664621422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664621422 is a wasteful number, since it uses less digits than its factorization.

664621422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110770242.

The product of its digits is 27648, while the sum is 33.

The square root of 664621422 is about 25780.2525588870. The cubic root of 664621422 is about 872.6862067305.

Adding to 664621422 its reverse (224126466), we get a palindrome (888747888).

The spelling of 664621422 in words is "six hundred sixty-four million, six hundred twenty-one thousand, four hundred twenty-two".