646502 has 4 divisors (see below), whose sum is σ = 969756. Its totient is φ = 323250.

The previous prime is 646453. The next prime is 646519. The reversal of 646502 is 205646.

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

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 646502.

It is an unprimeable number.

646502 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161624 + ... + 161627.

It is an arithmetic number, because the mean of its divisors is an integer number (242439).

2⁶⁴⁶⁵⁰² is an apocalyptic number.

646502 is a deficient number, since it is larger than the sum of its proper divisors (323254).

646502 is a wasteful number, since it uses less digits than its factorization.

646502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323253.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 646502 is about 804.0534808083. The cubic root of 646502 is about 86.4682409833.

The spelling of 646502 in words is "six hundred forty-six thousand, five hundred two".