664003 has 8 divisors (see below), whose sum is σ = 710640. Its totient is φ = 618240.

The previous prime is 663997. The next prime is 664009. The reversal of 664003 is 300466.

It is a happy number.

664003 is nontrivially palindromic in base 15.

It is an interprime number because it is at equal distance from previous prime (663997) and next prime (664009).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664009) 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, 2223 + ... + 2503.

It is an arithmetic number, because the mean of its divisors is an integer number (88830).

2⁶⁶⁴⁰⁰³ is an apocalyptic number.

664003 is a deficient number, since it is larger than the sum of its proper divisors (46637).

664003 is a wasteful number, since it uses less digits than its factorization.

664003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 664003 is about 814.8637922991. The cubic root of 664003 is about 87.2415448166.

Adding to 664003 its reverse (300466), we get a palindrome (964469).

It can be divided in two parts, 6 and 64003, that added together give a square (64009 = 253²).

The spelling of 664003 in words is "six hundred sixty-four thousand, three".