636402100 has 72 divisors (see below), whose sum is σ = 1474905600. Its totient is φ = 237820800.

The previous prime is 636402047. The next prime is 636402103. The reversal of 636402100 is 1204636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636402103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86361 + ... + 93439.

It is an arithmetic number, because the mean of its divisors is an integer number (20484800).

Almost surely, 2^636402100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636402100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737452800).

636402100 is an abundant number, since it is smaller than the sum of its proper divisors (838503500).

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

636402100 is a wasteful number, since it uses less digits than its factorization.

636402100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7153 (or 7146 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 636402100 is about 25227.0113172369. The cubic root of 636402100 is about 860.1559569335.

Adding to 636402100 its reverse (1204636), we get a palindrome (637606736).

The spelling of 636402100 in words is "six hundred thirty-six million, four hundred two thousand, one hundred".