636606 has 16 divisors (see below), whose sum is σ = 1414800. Its totient is φ = 212184.

The previous prime is 636569. The next prime is 636613. The reversal of 636606 is 606636.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 636606.

It is a congruent number.

It is an unprimeable number.

636606 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5841 + ... + 5948.

It is an arithmetic number, because the mean of its divisors is an integer number (88425).

2⁶³⁶⁶⁰⁶ is an apocalyptic number.

636606 is an abundant number, since it is smaller than the sum of its proper divisors (778194).

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

636606 is a wasteful number, since it uses less digits than its factorization.

636606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11800 (or 11794 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 636606 is about 797.8759302047. The cubic root of 636606 is about 86.0247810324.

The spelling of 636606 in words is "six hundred thirty-six thousand, six hundred six".