636289 has 8 divisors (see below), whose sum is σ = 677160. Its totient is φ = 596736.

The previous prime is 636287. The next prime is 636301. The reversal of 636289 is 982636.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 258064 + 378225 = 508^2 + 615^2 .

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

It is not a de Polignac number, because 636289 - 2¹ = 636287 is a prime.

It is a Duffinian number.

636289 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (636283) 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, 777 + ... + 1369.

It is an arithmetic number, because the mean of its divisors is an integer number (84645).

2⁶³⁶²⁸⁹ is an apocalyptic number.

It is an amenable number.

636289 is a deficient number, since it is larger than the sum of its proper divisors (40871).

636289 is a wasteful number, since it uses less digits than its factorization.

636289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659.

The product of its digits is 15552, while the sum is 34.

The square root of 636289 is about 797.6772530291. The cubic root of 636289 is about 86.0104998898.

The spelling of 636289 in words is "six hundred thirty-six thousand, two hundred eighty-nine".