• 800 can be written using four 4's:
800 is nontrivially palindromic in base 7.
It is an ABA number since it can be written as A⋅BA, here for A=2, B=20.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is an Ulam number.
It is a Duffinian number.
800 is a Rhonda number in base 12.
800 is a nontrivial repdigit in base 7.
It is a plaindrome in base 7, base 11 and base 12.
It is a nialpdrome in base 7, base 10 and base 16.
It is a zygodrome in base 7.
2800 is an apocalyptic number.
800 is a gapful number since it is divisible by the number (80) formed by its first and last digit.
800 is a droll number since its even prime factors and its odd prime factors have the same sum.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 800
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
800 is a wasteful number, since it uses less digits than its factorization.
800 is an odious number, because the sum of its binary digits is odd.
The square root of 800 is about 28.2842712475. The cubic root of 800 is about 9.2831776672.