216560 has 20 divisors (see below), whose sum is σ = 503688. Its totient is φ = 86592.

The previous prime is 216553. The next prime is 216569. The reversal of 216560 is 65612.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216569) 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, 1274 + ... + 1433.

2²¹⁶⁵⁶⁰ is an apocalyptic number.

216560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216560 is an abundant number, since it is smaller than the sum of its proper divisors (287128).

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

216560 is a wasteful number, since it uses less digits than its factorization.

216560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720 (or 2714 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 216560 is about 465.3600756404. The cubic root of 216560 is about 60.0518071060.

The spelling of 216560 in words is "two hundred sixteen thousand, five hundred sixty".