636506 has 8 divisors (see below), whose sum is σ = 1028244. Its totient is φ = 293760.

The previous prime is 636499. The next prime is 636533. The reversal of 636506 is 605636.

It can be written as a sum of positive squares in 2 ways, for example, as 469225 + 167281 = 685^2 + 409^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 24481 = 636506 / (6 + 3 + 6 + 5 + 0 + 6).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12215 + ... + 12266.

2⁶³⁶⁵⁰⁶ is an apocalyptic number.

636506 is a deficient number, since it is larger than the sum of its proper divisors (391738).

636506 is a wasteful number, since it uses less digits than its factorization.

636506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24496.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 636506 is about 797.8132613588. The cubic root of 636506 is about 86.0202764521.

The spelling of 636506 in words is "six hundred thirty-six thousand, five hundred six".