550640 has 20 divisors (see below), whose sum is σ = 1280424. Its totient is φ = 220224.

The previous prime is 550637. The next prime is 550651. The reversal of 550640 is 46055.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 550640.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3362 + ... + 3521.

2⁵⁵⁰⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

550640 is an abundant number, since it is smaller than the sum of its proper divisors (729784).

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

550640 is a wasteful number, since it uses less digits than its factorization.

550640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6896 (or 6890 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 550640 is about 742.0512111708. The cubic root of 550640 is about 81.9638944755.

Adding to 550640 its reverse (46055), we get a palindrome (596695).

The spelling of 550640 in words is "five hundred fifty thousand, six hundred forty".