216634 has 16 divisors (see below), whose sum is σ = 364320. Its totient is φ = 95760.

The previous prime is 216617. The next prime is 216641. The reversal of 216634 is 436612.

216634 is nontrivially palindromic in base 6.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 832 + ... + 1060.

It is an arithmetic number, because the mean of its divisors is an integer number (22770).

2²¹⁶⁶³⁴ is an apocalyptic number.

216634 is a deficient number, since it is larger than the sum of its proper divisors (147686).

216634 is a wasteful number, since it uses less digits than its factorization.

216634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285.

The product of its digits is 864, while the sum is 22.

The square root of 216634 is about 465.4395771741. The cubic root of 216634 is about 60.0586463618.

Subtracting from 216634 its sum of digits (22), we obtain a palindrome (216612).

The spelling of 216634 in words is "two hundred sixteen thousand, six hundred thirty-four".