545321220 has 144 divisors (see below), whose sum is σ = 1611949248. Its totient is φ = 137715200.

The previous prime is 545321201. The next prime is 545321221. The reversal of 545321220 is 22123545.

It is not an unprimeable number, because it can be changed into a prime (545321221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5096407 + ... + 5096513.

It is an arithmetic number, because the mean of its divisors is an integer number (11194092).

Almost surely, 2^545321220 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 545321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (805974624).

545321220 is an abundant number, since it is smaller than the sum of its proper divisors (1066628028).

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

545321220 is a wasteful number, since it uses less digits than its factorization.

545321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 545321220 is about 23352.1138229497. The cubic root of 545321220 is about 816.9913640610.

Adding to 545321220 its reverse (22123545), we get a palindrome (567444765).

The spelling of 545321220 in words is "five hundred forty-five million, three hundred twenty-one thousand, two hundred twenty".