556668 has 54 divisors (see below), whose sum is σ = 1643096. Its totient is φ = 155664.

The previous prime is 556651. The next prime is 556679. The reversal of 556668 is 866655.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a plaindrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11821 + ... + 11867.

2⁵⁵⁶⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 556668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821548).

556668 is an abundant number, since it is smaller than the sum of its proper divisors (1086428).

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

556668 is a wasteful number, since it uses less digits than its factorization.

556668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 59 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 556668 is about 746.1018697202. The cubic root of 556668 is about 82.2619030392.

The spelling of 556668 in words is "five hundred fifty-six thousand, six hundred sixty-eight".