646224 has 20 divisors (see below), whose sum is σ = 1669536. Its totient is φ = 215392.

The previous prime is 646199. The next prime is 646237. The reversal of 646224 is 422646.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is a d-powerful number, because it can be written as 6⁴ + 4⁴ + 2¹³ + 6⁶ + 2¹⁹ + 4⁸ .

It is a junction number, because it is equal to n+sod(n) for n = 646194 and 646203.

It is a congruent number.

It is an unprimeable number.

646224 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 in 3 ways as a sum of consecutive naturals, for example, 6684 + ... + 6779.

2⁶⁴⁶²²⁴ is an apocalyptic number.

It is an amenable number.

646224 is an abundant number, since it is smaller than the sum of its proper divisors (1023312).

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

646224 is a wasteful number, since it uses less digits than its factorization.

646224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13474 (or 13468 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

The square root of 646224 is about 803.8805881473. The cubic root of 646224 is about 86.4558452406.

The spelling of 646224 in words is "six hundred forty-six thousand, two hundred twenty-four".