• 766 can be written using four 4's:

See also 113.

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766 has 4 divisors (see below), whose sum is σ = 1152. Its totient is φ = 382.

The previous prime is 761. The next prime is 769. The reversal of 766 is 667.

766 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 667 = 23 ⋅29.

It is a plaindrome in base 13.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (761) by changing a digit.

766 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190 + ... + 193.

It is an arithmetic number, because the mean of its divisors is an integer number (288).

766 is the 18-th centered pentagonal number.

766 is a deficient number, since it is larger than the sum of its proper divisors (386).

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

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

The sum of its prime factors is 385.

The product of its digits is 252, while the sum is 19.

The square root of 766 is about 27.6767050062. The cubic root of 766 is about 9.1497576254.

Subtracting from 766 its sum of digits (19), we obtain a palindrome (747).

Subtracting from 766 its reverse (667), we obtain a palindrome (99).

The spelling of 766 in words is "seven hundred sixty-six", and thus it is an aban number and an oban number.