216530623 has 12 divisors (see below), whose sum is σ = 223735512. Its totient is φ = 209550240.

The previous prime is 216530609. The next prime is 216530641. The reversal of 216530623 is 326035612.

It is not a de Polignac number, because 216530623 - 2²⁵ = 182976191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216530591 and 216530600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216530653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 378928 + ... + 379498.

It is an arithmetic number, because the mean of its divisors is an integer number (18644626).

Almost surely, 2^216530623 is an apocalyptic number.

216530623 is a deficient number, since it is larger than the sum of its proper divisors (7204889).

216530623 is an equidigital number, since it uses as much as digits as its factorization.

216530623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 885 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 216530623 is about 14714.9795446681. The cubic root of 216530623 is about 600.4909158191.

The spelling of 216530623 in words is "two hundred sixteen million, five hundred thirty thousand, six hundred twenty-three".