549660 has 24 divisors (see below), whose sum is σ = 1539216. Its totient is φ = 146560.

The previous prime is 549649. The next prime is 549667. The reversal of 549660 is 66945.

Added to its reverse (66945) it gives a triangular number (616605 = T₁₁₁₀).

It is a super-2 number, since 2×549660² = 604252231200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549667) by changing a digit.

549660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4521 + ... + 4640.

It is an arithmetic number, because the mean of its divisors is an integer number (64134).

2⁵⁴⁹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

549660 is an abundant number, since it is smaller than the sum of its proper divisors (989556).

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

549660 is a wasteful number, since it uses less digits than its factorization.

549660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9173 (or 9171 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 549660 is about 741.3905853192. The cubic root of 549660 is about 81.9152405962.

Adding to 549660 its reverse (66945), we get a triangular number (616605 = T₁₁₁₀).

The spelling of 549660 in words is "five hundred forty-nine thousand, six hundred sixty".