216772765 has 16 divisors (see below), whose sum is σ = 286592256. Its totient is φ = 156088000.

The previous prime is 216772681. The next prime is 216772783. The reversal of 216772765 is 567277612.

It is not a de Polignac number, because 216772765 - 2⁷ = 216772637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13957 + ... + 25066.

It is an arithmetic number, because the mean of its divisors is an integer number (17912016).

Almost surely, 2^216772765 is an apocalyptic number.

It is an amenable number.

216772765 is a deficient number, since it is larger than the sum of its proper divisors (69819491).

216772765 is a wasteful number, since it uses less digits than its factorization.

216772765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39140.

The product of its digits is 246960, while the sum is 43.

The square root of 216772765 is about 14723.2049839700. The cubic root of 216772765 is about 600.7146715511.

It can be divided in two parts, 21677 and 2765, that added together give a palindrome (24442).

The spelling of 216772765 in words is "two hundred sixteen million, seven hundred seventy-two thousand, seven hundred sixty-five".