216520 has 16 divisors (see below), whose sum is σ = 487260. Its totient is φ = 86592.

The previous prime is 216509. The next prime is 216523. The reversal of 216520 is 25612.

It is a happy number.

216520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 206116 + 10404 = 454^2 + 102^2 .

It is a junction number, because it is equal to n+sod(n) for n = 216494 and 216503.

It is not an unprimeable number, because it can be changed into a prime (216523) 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, 2667 + ... + 2746.

2²¹⁶⁵²⁰ is an apocalyptic number.

216520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216520 is an abundant number, since it is smaller than the sum of its proper divisors (270740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216520 is a wasteful number, since it uses less digits than its factorization.

216520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5424 (or 5420 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 216520 is about 465.3170961828. The cubic root of 216520 is about 60.0481095623.

The spelling of 216520 in words is "two hundred sixteen thousand, five hundred twenty".