636872241 has 8 divisors (see below), whose sum is σ = 899113824. Its totient is φ = 399606080.

The previous prime is 636872189. The next prime is 636872251. The reversal of 636872241 is 142278636.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 636872241 - 2⁶ = 636872177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 636872241.

It is not an unprimeable number, because it can be changed into a prime (636872251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6243795 + ... + 6243896.

It is an arithmetic number, because the mean of its divisors is an integer number (112389228).

Almost surely, 2^636872241 is an apocalyptic number.

It is an amenable number.

636872241 is a deficient number, since it is larger than the sum of its proper divisors (262241583).

636872241 is a wasteful number, since it uses less digits than its factorization.

636872241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12487711.

The product of its digits is 96768, while the sum is 39.

The square root of 636872241 is about 25236.3278033869. The cubic root of 636872241 is about 860.3677177268.

The spelling of 636872241 in words is "six hundred thirty-six million, eight hundred seventy-two thousand, two hundred forty-one".