556646 has 8 divisors (see below), whose sum is σ = 871344. Its totient is φ = 266200.

The previous prime is 556639. The next prime is 556651. The reversal of 556646 is 646655.

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

It is a congruent number.

It is an unprimeable number.

556646 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 6005 + ... + 6096.

It is an arithmetic number, because the mean of its divisors is an integer number (108918).

2⁵⁵⁶⁶⁴⁶ is an apocalyptic number.

556646 is a deficient number, since it is larger than the sum of its proper divisors (314698).

556646 is a wasteful number, since it uses less digits than its factorization.

556646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12126.

The product of its digits is 21600, while the sum is 32.

The square root of 556646 is about 746.0871262795. The cubic root of 556646 is about 82.2608193378.

Subtracting 556646 from its reverse (646655), we obtain a palindrome (90009).

It can be divided in two parts, 5566 and 46, that multiplied together give a square (256036 = 506²).

The spelling of 556646 in words is "five hundred fifty-six thousand, six hundred forty-six".