646632 has 48 divisors (see below), whose sum is σ = 2003040. Its totient is φ = 184608.

The previous prime is 646631. The next prime is 646637. The reversal of 646632 is 236646.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 646596 and 646605.

It is not an unprimeable number, because it can be changed into a prime (646631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138 + ... + 1145.

It is an arithmetic number, because the mean of its divisors is an integer number (41730).

2⁶⁴⁶⁶³² 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 646632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1001520).

646632 is an abundant number, since it is smaller than the sum of its proper divisors (1356408).

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

646632 is a wasteful number, since it uses less digits than its factorization.

646632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302 (or 1295 counting only the distinct ones).

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

The square root of 646632 is about 804.1343171386. The cubic root of 646632 is about 86.4740363342.

The spelling of 646632 in words is "six hundred forty-six thousand, six hundred thirty-two".