650664 has 48 divisors (see below), whose sum is σ = 2015520. Its totient is φ = 185760.

The previous prime is 650627. The next prime is 650669. The reversal of 650664 is 466056.

650664 is a `hidden beast` number, since 650 + 6 + 6 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (650669) by changing a digit.

650664 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142 + ... + 1149.

It is an arithmetic number, because the mean of its divisors is an integer number (41990).

2⁶⁵⁰⁶⁶⁴ 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 650664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1007760).

650664 is an abundant number, since it is smaller than the sum of its proper divisors (1364856).

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

650664 is a wasteful number, since it uses less digits than its factorization.

650664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310 (or 1303 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 650664 is about 806.6374650362. The cubic root of 650664 is about 86.6533970479.

The spelling of 650664 in words is "six hundred fifty thousand, six hundred sixty-four".