646333 has 4 divisors (see below), whose sum is σ = 661408. Its totient is φ = 631260.

The previous prime is 646309. The next prime is 646339. The reversal of 646333 is 333646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 333646 = 2 ⋅166823.

It is a cyclic number.

It is not a de Polignac number, because 646333 - 2⁵ = 646301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646298 and 646307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7473 + ... + 7558.

It is an arithmetic number, because the mean of its divisors is an integer number (165352).

2⁶⁴⁶³³³ is an apocalyptic number.

It is an amenable number.

646333 is a deficient number, since it is larger than the sum of its proper divisors (15075).

646333 is a wasteful number, since it uses less digits than its factorization.

646333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15074.

The product of its digits is 3888, while the sum is 25.

The square root of 646333 is about 803.9483814276. The cubic root of 646333 is about 86.4607058654.

Adding to 646333 its reverse (333646), we get a palindrome (979979).

It can be divided in two parts, 646 and 333, that added together give a palindrome (979).

The spelling of 646333 in words is "six hundred forty-six thousand, three hundred thirty-three".