636404636 has 24 divisors (see below), whose sum is σ = 1285417056. Its totient is φ = 270043200.

The previous prime is 636404633. The next prime is 636404651.

636404636 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 636404636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636404633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109691 + ... + 115346.

It is an arithmetic number, because the mean of its divisors is an integer number (53559044).

Almost surely, 2^636404636 is an apocalyptic number.

It is an amenable number.

636404636 is an abundant number, since it is smaller than the sum of its proper divisors (649012420).

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

636404636 is a wasteful number, since it uses less digits than its factorization.

636404636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225149 (or 225147 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 38.

The square root of 636404636 is about 25227.0615807708. The cubic root of 636404636 is about 860.1570994777.

The spelling of 636404636 in words is "six hundred thirty-six million, four hundred four thousand, six hundred thirty-six".