636490269 has 6 divisors (see below), whose sum is σ = 919374846. Its totient is φ = 424326840.

The previous prime is 636490259. The next prime is 636490279. The reversal of 636490269 is 962094636.

636490269 is a `hidden beast` number, since 636 + 4 + 9 + 0 + 2 + 6 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (636490259) and next prime (636490279).

It can be written as a sum of positive squares in only one way, i.e., 401481369 + 235008900 = 20037^2 + 15330^2 .

It is not a de Polignac number, because 636490269 - 2¹¹ = 636488221 is a prime.

It is a super-2 number, since 2×636490269² = 810239725063384722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636490219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35360562 + ... + 35360579.

It is an arithmetic number, because the mean of its divisors is an integer number (153229141).

Almost surely, 2^636490269 is an apocalyptic number.

It is an amenable number.

636490269 is a deficient number, since it is larger than the sum of its proper divisors (282884577).

636490269 is a wasteful number, since it uses less digits than its factorization.

636490269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70721147 (or 70721144 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 636490269 is about 25228.7587685165. The cubic root of 636490269 is about 860.1956779361.

The spelling of 636490269 in words is "six hundred thirty-six million, four hundred ninety thousand, two hundred sixty-nine".