664120422 has 72 divisors (see below), whose sum is σ = 1705556736. Its totient is φ = 186155424.

The previous prime is 664120421. The next prime is 664120441. The reversal of 664120422 is 224021466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664120421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 39643 + ... + 53849.

It is an arithmetic number, because the mean of its divisors is an integer number (23688288).

Almost surely, 2^664120422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664120422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (852778368).

664120422 is an abundant number, since it is smaller than the sum of its proper divisors (1041436314).

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

664120422 is a wasteful number, since it uses less digits than its factorization.

664120422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14282 (or 14272 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 664120422 is about 25770.5339874827. The cubic root of 664120422 is about 872.4668709900.

Adding to 664120422 its reverse (224021466), we get a palindrome (888141888).

The spelling of 664120422 in words is "six hundred sixty-four million, one hundred twenty thousand, four hundred twenty-two".