636081852 has 24 divisors (see below), whose sum is σ = 1696218496. Its totient is φ = 181737648.

The previous prime is 636081847. The next prime is 636081857. The reversal of 636081852 is 258180636.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (636081847) and next prime (636081857).

It is a self number, because there is not a number n which added to its sum of digits gives 636081852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636081857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3786118 + ... + 3786285.

Almost surely, 2^636081852 is an apocalyptic number.

It is an amenable number.

636081852 is an abundant number, since it is smaller than the sum of its proper divisors (1060136644).

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

636081852 is a wasteful number, since it uses less digits than its factorization.

636081852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7572417 (or 7572415 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 636081852 is about 25220.6631950867. The cubic root of 636081852 is about 860.0116511852.

The spelling of 636081852 in words is "six hundred thirty-six million, eighty-one thousand, eight hundred fifty-two".