• 756 can be written using four 4's:
• 756 is smallest number which is not a square, but such that the products of its suffixes and its prefixes are squares. Indeed,
756 is nontrivially palindromic in base 5.
It is a plaindrome in base 15.
It is a nialpdrome in base 6 and base 12.
It is a zygodrome in base 6.
It is a congruent number.
756 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
756 is a wasteful number, since it uses less digits than its factorization.
756 is an evil number, because the sum of its binary digits is even.
The square root of 756 is about 27.4954541697. The cubic root of 756 is about 9.1097669156.
Subtracting from 756 its reverse (657), we obtain a palindrome (99).