545920 has 32 divisors (see below), whose sum is σ = 1306620. Its totient is φ = 218112.

The previous prime is 545917. The next prime is 545929. The reversal of 545920 is 29545.

It can be written as a sum of positive squares in 2 ways, for example, as 484416 + 61504 = 696^2 + 248^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (545929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214 + ... + 1066.

2⁵⁴⁵⁹²⁰ 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 545920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (653310).

545920 is an abundant number, since it is smaller than the sum of its proper divisors (760700).

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

545920 is an equidigital number, since it uses as much as digits as its factorization.

545920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 545920 is about 738.8639928972. The cubic root of 545920 is about 81.7290282160.

The spelling of 545920 in words is "five hundred forty-five thousand, nine hundred twenty".