556820 has 24 divisors (see below), whose sum is σ = 1276128. Its totient is φ = 202400.

The previous prime is 556819. The next prime is 556823. The reversal of 556820 is 28655.

556820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 556820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556823) 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, 1046 + ... + 1485.

It is an arithmetic number, because the mean of its divisors is an integer number (53172).

2⁵⁵⁶⁸²⁰ is an apocalyptic number.

It is an amenable number.

556820 is an abundant number, since it is smaller than the sum of its proper divisors (719308).

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

556820 is a wasteful number, since it uses less digits than its factorization.

556820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551 (or 2549 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 556820 is about 746.2037255334. The cubic root of 556820 is about 82.2693896509.

The spelling of 556820 in words is "five hundred fifty-six thousand, eight hundred twenty".