646263 has 6 divisors (see below), whose sum is σ = 933504. Its totient is φ = 430836.

The previous prime is 646259. The next prime is 646267. The reversal of 646263 is 362646.

It is an interprime number because it is at equal distance from previous prime (646259) and next prime (646267).

It is not a de Polignac number, because 646263 - 2² = 646259 is a prime.

646263 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646267) 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 5 ways as a sum of consecutive naturals, for example, 35895 + ... + 35912.

It is an arithmetic number, because the mean of its divisors is an integer number (155584).

2⁶⁴⁶²⁶³ is an apocalyptic number.

646263 is a deficient number, since it is larger than the sum of its proper divisors (287241).

646263 is a wasteful number, since it uses less digits than its factorization.

646263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71813 (or 71810 counting only the distinct ones).

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

The square root of 646263 is about 803.9048451154. The cubic root of 646263 is about 86.4575844260.

It can be divided in two parts, 646 and 263, that added together give a palindrome (909).

The spelling of 646263 in words is "six hundred forty-six thousand, two hundred sixty-three".