216730 has 8 divisors (see below), whose sum is σ = 390132. Its totient is φ = 86688.

The previous prime is 216719. The next prime is 216731. The reversal of 216730 is 37612.

It can be written as a sum of positive squares in 2 ways, for example, as 201601 + 15129 = 449^2 + 123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 216698 and 216707.

It is not an unprimeable number, because it can be changed into a prime (216731) 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, 10827 + ... + 10846.

2²¹⁶⁷³⁰ is an apocalyptic number.

216730 is a deficient number, since it is larger than the sum of its proper divisors (173402).

216730 is a wasteful number, since it uses less digits than its factorization.

216730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21680.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 216730 is about 465.5426940679. The cubic root of 216730 is about 60.0675165893.

It can be divided in two parts, 2167 and 30, that added together give a cube (2197 = 13³).

The spelling of 216730 in words is "two hundred sixteen thousand, seven hundred thirty".