636403130 has 24 divisors (see below), whose sum is σ = 1259133876. Its totient is φ = 231418880.

The previous prime is 636403127. The next prime is 636403147. The reversal of 636403130 is 31304636.

It can be written as a sum of positive squares in 2 ways, for example, as 636199729 + 203401 = 25223^2 + 451^2 .

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 636403130.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261767 + ... + 264186.

Almost surely, 2^636403130 is an apocalyptic number.

636403130 is a deficient number, since it is larger than the sum of its proper divisors (622730746).

636403130 is a wasteful number, since it uses less digits than its factorization.

636403130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525982 (or 525971 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 636403130 is about 25227.0317318546. The cubic root of 636403130 is about 860.1564209798.

Adding to 636403130 its reverse (31304636), we get a palindrome (667707766).

The spelling of 636403130 in words is "six hundred thirty-six million, four hundred three thousand, one hundred thirty".