636323389 has 8 divisors (see below), whose sum is σ = 692972280. Its totient is φ = 580774656.

The previous prime is 636323383. The next prime is 636323393. The reversal of 636323389 is 983323636.

It can be written as a sum of positive squares in 4 ways, for example, as 55995289 + 580328100 = 7483^2 + 24090^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 636323389 - 2³ = 636323381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636323381) 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, 273832 + ... + 276145.

It is an arithmetic number, because the mean of its divisors is an integer number (86621535).

Almost surely, 2^636323389 is an apocalyptic number.

It is an amenable number.

636323389 is a deficient number, since it is larger than the sum of its proper divisors (56648891).

636323389 is a wasteful number, since it uses less digits than its factorization.

636323389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550079.

The product of its digits is 419904, while the sum is 43.

The square root of 636323389 is about 25225.4512149932. The cubic root of 636323389 is about 860.1204937533.

The spelling of 636323389 in words is "six hundred thirty-six million, three hundred twenty-three thousand, three hundred eighty-nine".