636220 has 24 divisors (see below), whose sum is σ = 1439424. Its totient is φ = 234816.

The previous prime is 636217. The next prime is 636241. The reversal of 636220 is 22636.

It is a congruent number.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 964 + ... + 1483.

It is an arithmetic number, because the mean of its divisors is an integer number (59976).

2⁶³⁶²²⁰ is an apocalyptic number.

It is an amenable number.

636220 is an abundant number, since it is smaller than the sum of its proper divisors (803204).

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

636220 is a wasteful number, since it uses less digits than its factorization.

636220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469 (or 2467 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 636220 is about 797.6340012813. The cubic root of 636220 is about 86.0073907476.

Adding to 636220 its reverse (22636), we get a palindrome (658856).

The spelling of 636220 in words is "six hundred thirty-six thousand, two hundred twenty".