664822912 has 128 divisors (see below), whose sum is σ = 1542240000. Its totient is φ = 282906624.

The previous prime is 664822897. The next prime is 664822967. The reversal of 664822912 is 219228466.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1109589 + ... + 1110187.

It is an arithmetic number, because the mean of its divisors is an integer number (12048750).

Almost surely, 2^664822912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664822912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (771120000).

664822912 is an abundant number, since it is smaller than the sum of its proper divisors (877417088).

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

664822912 is a wasteful number, since it uses less digits than its factorization.

664822912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 666 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 664822912 is about 25784.1600987893. The cubic root of 664822912 is about 872.7743871450.

The spelling of 664822912 in words is "six hundred sixty-four million, eight hundred twenty-two thousand, nine hundred twelve".