664650 has 72 divisors (see below), whose sum is σ = 2050464. Its totient is φ = 151200.

The previous prime is 664633. The next prime is 664661. The reversal of 664650 is 56466.

664650 is a `hidden beast` number, since 6 + 6 + 4 + 650 = 666.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664650.

It is an unprimeable number.

664650 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 (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3045 + ... + 3255.

2⁶⁶⁴⁶⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025232).

664650 is an abundant number, since it is smaller than the sum of its proper divisors (1385814).

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

664650 is a wasteful number, since it uses less digits than its factorization.

664650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 228 counting only the distinct ones).

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

The square root of 664650 is about 815.2606945021. The cubic root of 664650 is about 87.2698714738.

The spelling of 664650 in words is "six hundred sixty-four thousand, six hundred fifty".