545540 has 12 divisors (see below), whose sum is σ = 1145676. Its totient is φ = 218208.

The previous prime is 545533. The next prime is 545543. The reversal of 545540 is 45545.

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 391876 = 392^2 + 626^2 .

It is a super-2 number, since 2×545540² = 595227783200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (545543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13619 + ... + 13658.

It is an arithmetic number, because the mean of its divisors is an integer number (95473).

2⁵⁴⁵⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

545540 is an abundant number, since it is smaller than the sum of its proper divisors (600136).

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

545540 is a wasteful number, since it uses less digits than its factorization.

545540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27286 (or 27284 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 545540 is about 738.6067966110. The cubic root of 545540 is about 81.7100606997.

The spelling of 545540 in words is "five hundred forty-five thousand, five hundred forty".