545221540 has 24 divisors (see below), whose sum is σ = 1147781880. Its totient is φ = 217552128.

The previous prime is 545221519. The next prime is 545221543. The reversal of 545221540 is 45122545.

It can be written as a sum of positive squares in 4 ways, for example, as 20994724 + 524226816 = 4582^2 + 22896^2 .

It is a junction number, because it is equal to n+sod(n) for n = 545221499 and 545221508.

It is not an unprimeable number, because it can be changed into a prime (545221543) 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, 25147 + ... + 41506.

It is an arithmetic number, because the mean of its divisors is an integer number (47824245).

Almost surely, 2^545221540 is an apocalyptic number.

It is an amenable number.

545221540 is an abundant number, since it is smaller than the sum of its proper divisors (602560340).

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

545221540 is a wasteful number, since it uses less digits than its factorization.

545221540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67071 (or 67069 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 545221540 is about 23349.9794432458. The cubic root of 545221540 is about 816.9415813772.

The spelling of 545221540 in words is "five hundred forty-five million, two hundred twenty-one thousand, five hundred forty".