65776 has 10 divisors (see below), whose sum is σ = 127472. Its totient is φ = 32880.

The previous prime is 65761. The next prime is 65777. The reversal of 65776 is 67756.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2040 + ... + 2071.

2⁶⁵⁷⁷⁶ is an apocalyptic number.

It is an amenable number.

65776 is a deficient number, since it is larger than the sum of its proper divisors (61696).

65776 is a wasteful number, since it uses less digits than its factorization.

65776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119 (or 4113 counting only the distinct ones).

The product of its digits is 8820, while the sum is 31.

The square root of 65776 is about 256.4683216306. The cubic root of 65776 is about 40.3666293069.

It can be divided in two parts, 65 and 776, that added together give a square (841 = 29²).

The spelling of 65776 in words is "sixty-five thousand, seven hundred seventy-six".