646448 has 20 divisors (see below), whose sum is σ = 1366728. Its totient is φ = 293760.

The previous prime is 646433. The next prime is 646453. The reversal of 646448 is 844646.

646448 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646448.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661 + ... + 2012.

2⁶⁴⁶⁴⁴⁸ is an apocalyptic number.

It is an amenable number.

646448 is an abundant number, since it is smaller than the sum of its proper divisors (720280).

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

646448 is a wasteful number, since it uses less digits than its factorization.

646448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692 (or 3686 counting only the distinct ones).

The product of its digits is 18432, while the sum is 32.

The square root of 646448 is about 804.0199002512. The cubic root of 646448 is about 86.4658334553.

Subtracting from 646448 its sum of digits (32), we obtain a square (646416 = 804²).

The spelling of 646448 in words is "six hundred forty-six thousand, four hundred forty-eight".