201684636 has 72 divisors (see below), whose sum is σ = 530776064. Its totient is φ = 64501920.

The previous prime is 201684607. The next prime is 201684641. The reversal of 201684636 is 636486102.

201684636 is a `hidden beast` number, since 2 + 0 + 16 + 8 + 4 + 636 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 201684636.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 141021 + ... + 142443.

Almost surely, 2^201684636 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 201684636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265388032).

201684636 is an abundant number, since it is smaller than the sum of its proper divisors (329091428).

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

201684636 is a wasteful number, since it uses less digits than its factorization.

201684636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1586 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 201684636 is about 14201.5716031712. The cubic root of 201684636 is about 586.4409274125.

The spelling of 201684636 in words is "two hundred one million, six hundred eighty-four thousand, six hundred thirty-six".