• 550 can be written using four 4's:

550 has 12 divisors (see below), whose sum is σ = 1116. Its totient is φ = 200.

The previous prime is 547. The next prime is 557. The reversal of 550 is 55.

550 = T_{4} + T_{5} + ... +
T_{14}.

550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

550 is a Gilda number.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

550 is an undulating number in base 7.

It is a plaindrome in base 12, base 13, base 15 and base 16.

It is a nialpdrome in base 5 and base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45 + ... + 55.

It is an arithmetic number, because the mean of its divisors is an integer number (93).

550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

550 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (558).

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

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

The sum of its prime factors is 23 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 10.

The square root of 550 is about 23.4520787991. The cubic root of 550 is about 8.1932127060.

550 divided by its sum of digits (10) gives a palindrome (55).

Adding to 550 its product of nonzero digits (25), we get a palindrome (575).

Subtracting from 550 its product of nonzero digits (25), we obtain a palindrome (525).

550 divided by its product of nonzero digits (25) gives a palindrome (22).

It can be divided in two parts, 5 and 50, that added together give a palindrome (55).

The spelling of 550 in words is "five hundred fifty", and thus it is an aban number and an oban number.

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