664786584 has 192 divisors, whose sum is σ = 2265569280. Its totient is φ = 172497600.

The previous prime is 664786567. The next prime is 664786589. The reversal of 664786584 is 485687466.

It is a self number, because there is not a number n which added to its sum of digits gives 664786584.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664786589) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 670329 + ... + 671319.

It is an arithmetic number, because the mean of its divisors is an integer number (11799840).

Almost surely, 2^664786584 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 664786584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1132784640).

664786584 is an abundant number, since it is smaller than the sum of its proper divisors (1600782696).

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

664786584 is a wasteful number, since it uses less digits than its factorization.

664786584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043 (or 1014 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The square root of 664786584 is about 25783.4556256527. The cubic root of 664786584 is about 872.7584898161.

The spelling of 664786584 in words is "six hundred sixty-four million, seven hundred eighty-six thousand, five hundred eighty-four".