636745536 has 168 divisors, whose sum is σ = 2163470400. Its totient is φ = 181896192.

The previous prime is 636745531. The next prime is 636745573. The reversal of 636745536 is 635547636.

636745536 is a `hidden beast` number, since 636 + 7 + 4 + 5 + 5 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a junction number, because it is equal to n+sod(n) for n = 636745491 and 636745500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636745531) 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 23 ways as a sum of consecutive naturals, for example, 105940 + ... + 111788.

It is an arithmetic number, because the mean of its divisors is an integer number (12877800).

Almost surely, 2^636745536 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 636745536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081735200).

636745536 is an abundant number, since it is smaller than the sum of its proper divisors (1526724864).

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

636745536 is an equidigital number, since it uses as much as digits as its factorization.

636745536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5883 (or 5861 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 45.

The square root of 636745536 is about 25233.8173093173. The cubic root of 636745536 is about 860.3106575532.

The spelling of 636745536 in words is "six hundred thirty-six million, seven hundred forty-five thousand, five hundred thirty-six".