550638 has 48 divisors (see below), whose sum is σ = 1362816. Its totient is φ = 165240.

The previous prime is 550637. The next prime is 550651. The reversal of 550638 is 836055.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 550638.

It is not an unprimeable number, because it can be changed into a prime (550631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5295 + ... + 5397.

It is an arithmetic number, because the mean of its divisors is an integer number (28392).

2⁵⁵⁰⁶³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 550638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681408).

550638 is an abundant number, since it is smaller than the sum of its proper divisors (812178).

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

550638 is a wasteful number, since it uses less digits than its factorization.

550638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 550638 is about 742.0498635537. The cubic root of 550638 is about 81.9637952407.

The spelling of 550638 in words is "five hundred fifty thousand, six hundred thirty-eight".