636493536 has 432 divisors, whose sum is σ = 2299044384. Its totient is φ = 166053888.

The previous prime is 636493531. The next prime is 636493577. The reversal of 636493536 is 635394636.

636493536 is a `hidden beast` number, since 636 + 4 + 9 + 3 + 5 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 636493491 and 636493500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636493531) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12009286 + ... + 12009338.

It is an arithmetic number, because the mean of its divisors is an integer number (5321862).

Almost surely, 2^636493536 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 636493536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149522192).

636493536 is an abundant number, since it is smaller than the sum of its proper divisors (1662550848).

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

636493536 is a wasteful number, since it uses less digits than its factorization.

636493536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 125 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 45.

The square root of 636493536 is about 25228.8235159708. The cubic root of 636493536 is about 860.1971496813.

The spelling of 636493536 in words is "six hundred thirty-six million, four hundred ninety-three thousand, five hundred thirty-six".