636224 has 14 divisors (see below), whose sum is σ = 1262634. Its totient is φ = 318080.

The previous prime is 636217. The next prime is 636241. The reversal of 636224 is 422636.

It can be written as a sum of positive squares in only one way, i.e., 322624 + 313600 = 568^2 + 560^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 636224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4907 + ... + 5034.

2⁶³⁶²²⁴ is an apocalyptic number.

636224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

636224 is a deficient number, since it is larger than the sum of its proper divisors (626410).

636224 is an equidigital number, since it uses as much as digits as its factorization.

636224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9953 (or 9943 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 636224 is about 797.6365086930. The cubic root of 636224 is about 86.0075709938.

The spelling of 636224 in words is "six hundred thirty-six thousand, two hundred twenty-four".