646363 has 4 divisors (see below), whose sum is σ = 648720. Its totient is φ = 644008.

The previous prime is 646339. The next prime is 646379. The reversal of 646363 is 363646.

646363 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646363 - 2⁹ = 645851 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640363) 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, 703 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (162180).

2⁶⁴⁶³⁶³ is an apocalyptic number.

646363 is a deficient number, since it is larger than the sum of its proper divisors (2357).

646363 is a wasteful number, since it uses less digits than its factorization.

646363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356.

The product of its digits is 7776, while the sum is 28.

The square root of 646363 is about 803.9670391254. The cubic root of 646363 is about 86.4620435562.

The spelling of 646363 in words is "six hundred forty-six thousand, three hundred sixty-three".