216728527 has 4 divisors (see below), whose sum is σ = 218874456. Its totient is φ = 214582600.

The previous prime is 216728509. The next prime is 216728581. The reversal of 216728527 is 725827612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216728527 - 2¹¹ = 216726479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216728527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216728587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072813 + ... + 1073014.

It is an arithmetic number, because the mean of its divisors is an integer number (54718614).

Almost surely, 2^216728527 is an apocalyptic number.

216728527 is a deficient number, since it is larger than the sum of its proper divisors (2145929).

216728527 is a wasteful number, since it uses less digits than its factorization.

216728527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145928.

The product of its digits is 94080, while the sum is 40.

The square root of 216728527 is about 14721.7025849594. The cubic root of 216728527 is about 600.6738050650.

The spelling of 216728527 in words is "two hundred sixteen million, seven hundred twenty-eight thousand, five hundred twenty-seven".