636525216 has 120 divisors (see below), whose sum is σ = 1915873344. Its totient is φ = 207204480.

The previous prime is 636525187. The next prime is 636525221. The reversal of 636525216 is 612525636.

It is a happy number.

636525216 is a `hidden beast` number, since 636 + 5 + 2 + 5 + 2 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 108601 + ... + 114311.

Almost surely, 2^636525216 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 636525216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (957936672).

636525216 is an abundant number, since it is smaller than the sum of its proper divisors (1279348128).

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

636525216 is a wasteful number, since it uses less digits than its factorization.

636525216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5776 (or 5759 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 636525216 is about 25229.4513614545. The cubic root of 636525216 is about 860.2114208886.

The spelling of 636525216 in words is "six hundred thirty-six million, five hundred twenty-five thousand, two hundred sixteen".