635636 has 6 divisors (see below), whose sum is σ = 1112370. Its totient is φ = 317816.

The previous prime is 635617. The next prime is 635639. The reversal of 635636 is 636536.

It can be written as a sum of positive squares in only one way, i.e., 414736 + 220900 = 644^2 + 470^2 .

It is a junction number, because it is equal to n+sod(n) for n = 635599 and 635608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635639) by changing a digit.

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 as a sum of consecutive naturals, namely, 79451 + ... + 79458.

It is an arithmetic number, because the mean of its divisors is an integer number (185395).

2⁶³⁵⁶³⁶ is an apocalyptic number.

It is an amenable number.

635636 is a deficient number, since it is larger than the sum of its proper divisors (476734).

635636 is a wasteful number, since it uses less digits than its factorization.

635636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158913 (or 158911 counting only the distinct ones).

The product of its digits is 9720, while the sum is 29.

The square root of 635636 is about 797.2678345450. The cubic root of 635636 is about 85.9810666812.

Subtracting 635636 from its reverse (636536), we obtain a square (900 = 30²).

The spelling of 635636 in words is "six hundred thirty-five thousand, six hundred thirty-six".