556638 has 16 divisors (see below), whose sum is σ = 1124496. Its totient is φ = 183680.

The previous prime is 556627. The next prime is 556639. The reversal of 556638 is 836655.

It is a junction number, because it is equal to n+sod(n) for n = 556599 and 556608.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268 + ... + 1088.

It is an arithmetic number, because the mean of its divisors is an integer number (70281).

2⁵⁵⁶⁶³⁸ is an apocalyptic number.

556638 is an abundant number, since it is smaller than the sum of its proper divisors (567858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

556638 is a wasteful number, since it uses less digits than its factorization.

556638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939.

The product of its digits is 21600, while the sum is 33.

The square root of 556638 is about 746.0817649561. The cubic root of 556638 is about 82.2604252575.

The spelling of 556638 in words is "five hundred fifty-six thousand, six hundred thirty-eight".