244 (number) explained

244 (two hundred [and] forty-four) is the natural number following 243 and preceding 245.

Number:	244
Prime:	no

Additionally, 244 is:

• the sum of two nonzero fifth powers .^[1]
• palindromic in bases 3 (100001₃), 11 (202₁₁), 60 (44₆₀), 121 (22₁₂₁), 243 (11₂₄₃).
• a Harshad number in bases 3, 9, 11, 61, 62, 81, 121, 122, 123 and 184.
• the second anti-perfect number, meaning that reversing the digits of the proper divisors of 244 and adding the results gives 244 back again.^[2]
• part of the sequence 1, 2, 4, 8, 61, 221, 244, ... in which each number is formed by reversing the digits of the double of the previous number.^[3]
• the number of non-isomorphic set-systems of weight 8

Notes and References

1. Positive numbers n such that n = x^5 + y^5 has a solution in nonzero integers x, y.
2. Numbers n such that n = the sum of the reverses of the proper divisors of n.
3. Double and reverse digits.