636323047 has 4 divisors (see below), whose sum is σ = 636644320. Its totient is φ = 636001776.

The previous prime is 636323027. The next prime is 636323071. The reversal of 636323047 is 740323636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636323047 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 (636323027) 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 3 ways as a sum of consecutive naturals, for example, 157647 + ... + 161632.

It is an arithmetic number, because the mean of its divisors is an integer number (159161080).

Almost surely, 2^636323047 is an apocalyptic number.

636323047 is a deficient number, since it is larger than the sum of its proper divisors (321273).

636323047 is a wasteful number, since it uses less digits than its factorization.

636323047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321272.

The product of its (nonzero) digits is 54432, while the sum is 34.

The square root of 636323047 is about 25225.4444361244. Note that the first 4 decimals coincide. The cubic root of 636323047 is about 860.1203396591.

The spelling of 636323047 in words is "six hundred thirty-six million, three hundred twenty-three thousand, forty-seven".