646503 has 24 divisors (see below), whose sum is σ = 1027824. Its totient is φ = 359040.

The previous prime is 646453. The next prime is 646519. The reversal of 646503 is 305646.

It is not a de Polignac number, because 646503 - 2¹² = 642407 is a prime.

It is a super-2 number, since 2×646503² = 835932258018, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646503.

It is not an unprimeable number, because it can be changed into a prime (646523) 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 23 ways as a sum of consecutive naturals, for example, 4651 + ... + 4787.

It is an arithmetic number, because the mean of its divisors is an integer number (42826).

2⁶⁴⁶⁵⁰³ is an apocalyptic number.

646503 is a deficient number, since it is larger than the sum of its proper divisors (381321).

646503 is a wasteful number, since it uses less digits than its factorization.

646503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 646503 is about 804.0541026573. The cubic root of 646503 is about 86.4682855659.

The spelling of 646503 in words is "six hundred forty-six thousand, five hundred three".