55720 has 32 divisors (see below), whose sum is σ = 144000. Its totient is φ = 19008.

The previous prime is 55717. The next prime is 55721. The reversal of 55720 is 2755.

It is a happy number.

55720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55721) 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, 181 + ... + 379.

It is an arithmetic number, because the mean of its divisors is an integer number (4500).

2⁵⁵⁷²⁰ 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 55720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72000).

55720 is an abundant number, since it is smaller than the sum of its proper divisors (88280).

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

55720 is a wasteful number, since it uses less digits than its factorization.

55720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 19.

The square root of 55720 is about 236.0508419811. The cubic root of 55720 is about 38.1947527125.

The spelling of 55720 in words is "fifty-five thousand, seven hundred twenty".