636343887 has 8 divisors (see below), whose sum is σ = 862367920. Its totient is φ = 417274560.

The previous prime is 636343867. The next prime is 636343891. The reversal of 636343887 is 788343636.

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

It is not a de Polignac number, because 636343887 - 2⁷ = 636343759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636343867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1738462 + ... + 1738827.

It is an arithmetic number, because the mean of its divisors is an integer number (107795990).

Almost surely, 2^636343887 is an apocalyptic number.

636343887 is a deficient number, since it is larger than the sum of its proper divisors (226024033).

636343887 is a wasteful number, since it uses less digits than its factorization.

636343887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477353.

The product of its digits is 1741824, while the sum is 48.

The square root of 636343887 is about 25225.8575077241. The cubic root of 636343887 is about 860.1297293930.

The spelling of 636343887 in words is "six hundred thirty-six million, three hundred forty-three thousand, eight hundred eighty-seven".