556720 has 20 divisors (see below), whose sum is σ = 1294560. Its totient is φ = 222656.

The previous prime is 556709. The next prime is 556723. The reversal of 556720 is 27655.

It is a happy number.

556720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3400 + ... + 3559.

It is an arithmetic number, because the mean of its divisors is an integer number (64728).

2⁵⁵⁶⁷²⁰ is an apocalyptic number.

It is an amenable number.

556720 is an abundant number, since it is smaller than the sum of its proper divisors (737840).

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

556720 is a wasteful number, since it uses less digits than its factorization.

556720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6972 (or 6966 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 556720 is about 746.1367166947. The cubic root of 556720 is about 82.2644644018.

The spelling of 556720 in words is "five hundred fifty-six thousand, seven hundred twenty".