216678833 has 6 divisors (see below), whose sum is σ = 252055026. Its totient is φ = 185724672.

The previous prime is 216678827. The next prime is 216678841. The reversal of 216678833 is 338876612.

It can be written as a sum of positive squares in only one way, i.e., 212809744 + 3869089 = 14588^2 + 1967^2 .

It is not a de Polignac number, because 216678833 - 2²² = 212484529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216678433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2210960 + ... + 2211057.

It is an arithmetic number, because the mean of its divisors is an integer number (42009171).

Almost surely, 2^216678833 is an apocalyptic number.

It is an amenable number.

216678833 is a deficient number, since it is larger than the sum of its proper divisors (35376193).

216678833 is an equidigital number, since it uses as much as digits as its factorization.

216678833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422031 (or 4422024 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 216678833 is about 14720.0147078731. The cubic root of 216678833 is about 600.6278917648.

The spelling of 216678833 in words is "two hundred sixteen million, six hundred seventy-eight thousand, eight hundred thirty-three".