646550 has 24 divisors (see below), whose sum is σ = 1226856. Its totient is φ = 253440.

The previous prime is 646549. The next prime is 646571. The reversal of 646550 is 55646.

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 646550.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3254 + ... + 3446.

It is an arithmetic number, because the mean of its divisors is an integer number (51119).

2⁶⁴⁶⁵⁵⁰ is an apocalyptic number.

646550 is a deficient number, since it is larger than the sum of its proper divisors (580306).

646550 is a wasteful number, since it uses less digits than its factorization.

646550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 646550 is about 804.0833290151. The cubic root of 646550 is about 86.4703808956.

The spelling of 646550 in words is "six hundred forty-six thousand, five hundred fifty".