664886500 has 48 divisors (see below), whose sum is σ = 1467189360. Its totient is φ = 263193600.

The previous prime is 664886491. The next prime is 664886501. The reversal of 664886500 is 5688466.

664886500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 114233344 + 550653156 = 10688^2 + 23466^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (664886501) 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, 41646 + ... + 55354.

It is an arithmetic number, because the mean of its divisors is an integer number (30566445).

Almost surely, 2^664886500 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 664886500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733594680).

664886500 is an abundant number, since it is smaller than the sum of its proper divisors (802302860).

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

664886500 is a wasteful number, since it uses less digits than its factorization.

664886500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13825 (or 13813 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 664886500 is about 25785.3931519378. The cubic root of 664886500 is about 872.8022122031.

The spelling of 664886500 in words is "six hundred sixty-four million, eight hundred eighty-six thousand, five hundred".