545220 has 72 divisors (see below), whose sum is σ = 1788696. Its totient is φ = 133632.

The previous prime is 545213. The next prime is 545231. The reversal of 545220 is 22545.

It can be written as a sum of positive squares in 4 ways, for example, as 576 + 544644 = 24^2 + 738^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 545193 and 545202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2224 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (24843).

2⁵⁴⁵²²⁰ 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 545220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894348).

545220 is an abundant number, since it is smaller than the sum of its proper divisors (1243476).

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

545220 is a wasteful number, since it uses less digits than its factorization.

545220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 545220 is about 738.3901407792. The cubic root of 545220 is about 81.6940812215.

Adding to 545220 its reverse (22545), we get a palindrome (567765).

The spelling of 545220 in words is "five hundred forty-five thousand, two hundred twenty".