664750 has 16 divisors (see below), whose sum is σ = 1244880. Its totient is φ = 265800.

The previous prime is 664739. The next prime is 664757. The reversal of 664750 is 57466.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1080 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (77805).

2⁶⁶⁴⁷⁵⁰ is an apocalyptic number.

664750 is a deficient number, since it is larger than the sum of its proper divisors (580130).

664750 is a wasteful number, since it uses less digits than its factorization.

664750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676 (or 2666 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 664750 is about 815.3220222710. The cubic root of 664750 is about 87.2742479875.

The spelling of 664750 in words is "six hundred sixty-four thousand, seven hundred fifty".