646000 has 80 divisors (see below), whose sum is σ = 1740960. Its totient is φ = 230400.

The previous prime is 645979. The next prime is 646003. The reversal of 646000 is 646.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646003) by changing a digit.

646000 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33991 + ... + 34009.

It is an arithmetic number, because the mean of its divisors is an integer number (21762).

2⁶⁴⁶⁰⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (870480).

646000 is an abundant number, since it is smaller than the sum of its proper divisors (1094960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646000 is a wasteful number, since it uses less digits than its factorization.

646000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 646000 is about 803.7412518964. The cubic root of 646000 is about 86.4458547175.

Adding to 646000 its reverse (646), we get a palindrome (646646).

646000 divided by its reverse (646) gives a cube (1000 = 10³).

The spelling of 646000 in words is "six hundred forty-six thousand".