636138450 has 36 divisors (see below), whose sum is σ = 1709093178. Its totient is φ = 169636800.

The previous prime is 636138427. The next prime is 636138457. The reversal of 636138450 is 54831636.

636138450 is a `hidden beast` number, since 636 + 13 + 8 + 4 + 5 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 243266409 + 392872041 = 15597^2 + 19821^2 .

It is not an unprimeable number, because it can be changed into a prime (636138457) 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 17 ways as a sum of consecutive naturals, for example, 706371 + ... + 707270.

Almost surely, 2^636138450 is an apocalyptic number.

636138450 is an abundant number, since it is smaller than the sum of its proper divisors (1072954728).

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

636138450 is a wasteful number, since it uses less digits than its factorization.

636138450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413659 (or 1413651 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 636138450 is about 25221.7852262682. The cubic root of 636138450 is about 860.0371581205.

The spelling of 636138450 in words is "six hundred thirty-six million, one hundred thirty-eight thousand, four hundred fifty".