664850 has 12 divisors (see below), whose sum is σ = 1236714. Its totient is φ = 265920.

The previous prime is 664849. The next prime is 664879. The reversal of 664850 is 58466.

It can be written as a sum of positive squares in 3 ways, for example, as 259081 + 405769 = 509^2 + 637^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664850.

It is an unprimeable 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 5 ways as a sum of consecutive naturals, for example, 6599 + ... + 6698.

2⁶⁶⁴⁸⁵⁰ is an apocalyptic number.

664850 is a deficient number, since it is larger than the sum of its proper divisors (571864).

664850 is a wasteful number, since it uses less digits than its factorization.

664850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13309 (or 13304 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 664850 is about 815.3833454272. The cubic root of 664850 is about 87.2786240623.

The spelling of 664850 in words is "six hundred sixty-four thousand, eight hundred fifty".