636428500 has 24 divisors (see below), whose sum is σ = 1389960936. Its totient is φ = 254571200.

The previous prime is 636428497. The next prime is 636428521. The reversal of 636428500 is 5824636.

It is a happy number.

636428500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 141276996 + 495151504 = 11886^2 + 22252^2 .

It is a super-3 number, since 3×636428500³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635929 + ... + 636928.

It is an arithmetic number, because the mean of its divisors is an integer number (57915039).

Almost surely, 2^636428500 is an apocalyptic number.

It is an amenable number.

636428500 is an abundant number, since it is smaller than the sum of its proper divisors (753532436).

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

636428500 is a wasteful number, since it uses less digits than its factorization.

636428500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272876 (or 1272864 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 636428500 is about 25227.5345604758. The cubic root of 636428500 is about 860.1678507782.

The spelling of 636428500 in words is "six hundred thirty-six million, four hundred twenty-eight thousand, five hundred".