636320242 has 16 divisors (see below), whose sum is σ = 960986880. Its totient is φ = 315998352.

The previous prime is 636320227. The next prime is 636320249. The reversal of 636320242 is 242023636.

It is a self number, because there is not a number n which added to its sum of digits gives 636320242.

It is not an unprimeable number, because it can be changed into a prime (636320249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225613 + ... + 228415.

It is an arithmetic number, because the mean of its divisors is an integer number (60061680).

Almost surely, 2^636320242 is an apocalyptic number.

636320242 is a deficient number, since it is larger than the sum of its proper divisors (324666638).

636320242 is a wasteful number, since it uses less digits than its factorization.

636320242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537.

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 636320242 is about 25225.3888374392. The cubic root of 636320242 is about 860.1190758141.

Adding to 636320242 its reverse (242023636), we get a palindrome (878343878).

The spelling of 636320242 in words is "six hundred thirty-six million, three hundred twenty thousand, two hundred forty-two".