664830528 has 56 divisors (see below), whose sum is σ = 1774655328. Its totient is φ = 219641856.

The previous prime is 664830499. The next prime is 664830533. The reversal of 664830528 is 825038466.

It is a self number, because there is not a number n which added to its sum of digits gives 664830528.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6375 + ... + 37017.

Almost surely, 2^664830528 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 664830528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887327664).

664830528 is an abundant number, since it is smaller than the sum of its proper divisors (1109824800).

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

664830528 is a wasteful number, since it uses less digits than its factorization.

664830528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30771 (or 30761 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 664830528 is about 25784.3077859383. The cubic root of 664830528 is about 872.7777198743. Note that the first 4 decimals are identical.

The spelling of 664830528 in words is "six hundred sixty-four million, eight hundred thirty thousand, five hundred twenty-eight".