556636 has 18 divisors (see below), whose sum is σ = 1020768. Its totient is φ = 265320.

The previous prime is 556627. The next prime is 556639. The reversal of 556636 is 636655.

It is a happy number.

556636 is nontrivially palindromic in base 5.

It is a super-3 number, since 3×556636³ = 517410367333762368, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

Its product of digits (16200) is a multiple of the sum of its prime divisors (100).

It is a junction number, because it is equal to n+sod(n) for n = 556598 and 556607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556639) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 8275 + ... + 8341.

2⁵⁵⁶⁶³⁶ is an apocalyptic number.

It is an amenable number.

556636 is a deficient number, since it is larger than the sum of its proper divisors (464132).

556636 is a wasteful number, since it uses less digits than its factorization.

556636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 100 counting only the distinct ones).

The product of its digits is 16200, while the sum is 31.

The square root of 556636 is about 746.0804246192. The cubic root of 556636 is about 82.2603267368.

Multiplying 556636 by its sum of digits (31), we get a square (17255716 = 4154²).

556636 divided by its sum of digits (31) gives a square (17956 = 134²).

The spelling of 556636 in words is "five hundred fifty-six thousand, six hundred thirty-six".