216775 has 24 divisors (see below), whose sum is σ = 312480. Its totient is φ = 147840.

The previous prime is 216761. The next prime is 216779. The reversal of 216775 is 577612.

216775 = 19³ + 20³ + ... + 31³.

216775 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 216775 - 2⁵ = 216743 is a prime.

Its product of digits (2940) is a multiple of the sum of its prime divisors (70).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7461 + ... + 7489.

It is an arithmetic number, because the mean of its divisors is an integer number (13020).

2²¹⁶⁷⁷⁵ is an apocalyptic number.

216775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216775 is a deficient number, since it is larger than the sum of its proper divisors (95705).

216775 is a wasteful number, since it uses less digits than its factorization.

216775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75 (or 70 counting only the distinct ones).

The product of its digits is 2940, while the sum is 28.

The square root of 216775 is about 465.5910222502. The cubic root of 216775 is about 60.0716736067.

The spelling of 216775 in words is "two hundred sixteen thousand, seven hundred seventy-five".