216780 has 24 divisors (see below), whose sum is σ = 607152. Its totient is φ = 57792.

The previous prime is 216779. The next prime is 216781. The reversal of 216780 is 87612.

It is an interprime number because it is at equal distance from previous prime (216779) and next prime (216781).

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 216780.

It is not an unprimeable number, because it can be changed into a prime (216781) 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, 1747 + ... + 1866.

It is an arithmetic number, because the mean of its divisors is an integer number (25298).

2²¹⁶⁷⁸⁰ is an apocalyptic number.

216780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216780 is an abundant number, since it is smaller than the sum of its proper divisors (390372).

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

216780 is a wasteful number, since it uses less digits than its factorization.

216780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625 (or 3623 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 216780 is about 465.5963917386. The cubic root of 216780 is about 60.0721354621.

The spelling of 216780 in words is "two hundred sixteen thousand, seven hundred eighty".