664246422 has 96 divisors (see below), whose sum is σ = 1778400000. Its totient is φ = 174913344.

The previous prime is 664246399. The next prime is 664246469. The reversal of 664246422 is 224642466.

664246422 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 4 + 642 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84829 + ... + 92327.

It is an arithmetic number, because the mean of its divisors is an integer number (18525000).

Almost surely, 2^664246422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664246422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (889200000).

664246422 is an abundant number, since it is smaller than the sum of its proper divisors (1114153578).

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

664246422 is a wasteful number, since it uses less digits than its factorization.

664246422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7570 (or 7567 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

The square root of 664246422 is about 25772.9785240278. The cubic root of 664246422 is about 872.5220436518.

Adding to 664246422 its reverse (224642466), we get a palindrome (888888888).

The spelling of 664246422 in words is "six hundred sixty-four million, two hundred forty-six thousand, four hundred twenty-two".