216764565 has 8 divisors (see below), whose sum is σ = 346823328. Its totient is φ = 115607760.

The previous prime is 216764557. The next prime is 216764567. The reversal of 216764565 is 565467612.

216764565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216764565 - 2³ = 216764557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216764567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7225471 + ... + 7225500.

It is an arithmetic number, because the mean of its divisors is an integer number (43352916).

Almost surely, 2^216764565 is an apocalyptic number.

It is an amenable number.

216764565 is a deficient number, since it is larger than the sum of its proper divisors (130058763).

216764565 is a wasteful number, since it uses less digits than its factorization.

216764565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14450979.

The product of its digits is 302400, while the sum is 42.

The square root of 216764565 is about 14722.9265093595. The cubic root of 216764565 is about 600.7070969181.

The spelling of 216764565 in words is "two hundred sixteen million, seven hundred sixty-four thousand, five hundred sixty-five".