664586636 has 48 divisors (see below), whose sum is σ = 1408565760. Its totient is φ = 268012800.

The previous prime is 664586623. The next prime is 664586639. The reversal of 664586636 is 636685466.

664586636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (664586639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76196 + ... + 84468.

It is an arithmetic number, because the mean of its divisors is an integer number (29345120).

Almost surely, 2^664586636 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 664586636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704282880).

664586636 is an abundant number, since it is smaller than the sum of its proper divisors (743979124).

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

664586636 is a wasteful number, since it uses less digits than its factorization.

664586636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8454 (or 8452 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 50.

The square root of 664586636 is about 25779.5778863813. The cubic root of 664586636 is about 872.6709811243.

The spelling of 664586636 in words is "six hundred sixty-four million, five hundred eighty-six thousand, six hundred thirty-six".