636321312 has 384 divisors, whose sum is σ = 2194698240. Its totient is φ = 177408000.

The previous prime is 636321293. The next prime is 636321347. The reversal of 636321312 is 213123636.

It is a happy number.

636321312 is a `hidden beast` number, since 6 + 3 + 632 + 13 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8962237 + ... + 8962307.

It is an arithmetic number, because the mean of its divisors is an integer number (5715360).

Almost surely, 2^636321312 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 636321312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097349120).

636321312 is an abundant number, since it is smaller than the sum of its proper divisors (1558376928).

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

636321312 is a wasteful number, since it uses less digits than its factorization.

636321312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 151 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 636321312 is about 25225.4100462213. The cubic root of 636321312 is about 860.1195579230.

Adding to 636321312 its reverse (213123636), we get a palindrome (849444948).

The spelling of 636321312 in words is "six hundred thirty-six million, three hundred twenty-one thousand, three hundred twelve".