636432642 has 24 divisors (see below), whose sum is σ = 1401545340. Its totient is φ = 208666080.

The previous prime is 636432623. The next prime is 636432647. The reversal of 636432642 is 246234636.

636432642 is a `hidden beast` number, since 6 + 3 + 6 + 4 + 3 + 2 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 635493681 + 938961 = 25209^2 + 969^2 .

It is a junction number, because it is equal to n+sod(n) for n = 636432597 and 636432606.

It is not an unprimeable number, because it can be changed into a prime (636432647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288717 + ... + 290912.

Almost surely, 2^636432642 is an apocalyptic number.

636432642 is an abundant number, since it is smaller than the sum of its proper divisors (765112698).

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

636432642 is a wasteful number, since it uses less digits than its factorization.

636432642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579698 (or 579695 counting only the distinct ones).

The product of its digits is 124416, while the sum is 36.

The square root of 636432642 is about 25227.6166531839. The cubic root of 636432642 is about 860.1697168205.

The spelling of 636432642 in words is "six hundred thirty-six million, four hundred thirty-two thousand, six hundred forty-two".