645333 has 8 divisors (see below), whose sum is σ = 926688. Its totient is φ = 397104.

The previous prime is 645329. The next prime is 645347. The reversal of 645333 is 333546.

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

It is not a de Polignac number, because 645333 - 2² = 645329 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8235 + ... + 8312.

It is an arithmetic number, because the mean of its divisors is an integer number (115836).

2⁶⁴⁵³³³ is an apocalyptic number.

It is an amenable number.

645333 is a deficient number, since it is larger than the sum of its proper divisors (281355).

645333 is a wasteful number, since it uses less digits than its factorization.

645333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16563.

The product of its digits is 3240, while the sum is 24.

The square root of 645333 is about 803.3262102036. The cubic root of 645333 is about 86.4160924672.

Adding to 645333 its reverse (333546), we get a palindrome (978879).

The spelling of 645333 in words is "six hundred forty-five thousand, three hundred thirty-three".