664263 has 12 divisors (see below), whose sum is σ = 1001520. Its totient is φ = 423456.

The previous prime is 664253. The next prime is 664271. The reversal of 664263 is 362466.

It is not a de Polignac number, because 664263 - 2⁶ = 664199 is a prime.

It is a d-powerful number, because it can be written as 6⁶ + 6⁶ + 2¹⁹ + 4 + 6⁶ + 3 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1398 + ... + 1811.

It is an arithmetic number, because the mean of its divisors is an integer number (83460).

2⁶⁶⁴²⁶³ is an apocalyptic number.

664263 is a deficient number, since it is larger than the sum of its proper divisors (337257).

664263 is a wasteful number, since it uses less digits than its factorization.

664263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238 (or 3235 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 664263 is about 815.0233125500. The cubic root of 664263 is about 87.2529302278.

The spelling of 664263 in words is "six hundred sixty-four thousand, two hundred sixty-three".