216564769 has 8 divisors (see below), whose sum is σ = 218129120. Its totient is φ = 215006400.

The previous prime is 216564713. The next prime is 216564773. The reversal of 216564769 is 967465612.

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

It is a cyclic number.

It is not a de Polignac number, because 216564769 - 2¹³ = 216556577 is a prime.

It is a super-2 number, since 2×216564769² = 93800598344046722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216564169) 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, 90154 + ... + 92524.

It is an arithmetic number, because the mean of its divisors is an integer number (27266140).

Almost surely, 2^216564769 is an apocalyptic number.

It is an amenable number.

216564769 is a deficient number, since it is larger than the sum of its proper divisors (1564351).

216564769 is a wasteful number, since it uses less digits than its factorization.

216564769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991.

The product of its digits is 544320, while the sum is 46.

The square root of 216564769 is about 14716.1397451913. The cubic root of 216564769 is about 600.5224791531.

The spelling of 216564769 in words is "two hundred sixteen million, five hundred sixty-four thousand, seven hundred sixty-nine".