216816827 has 8 divisors (see below), whose sum is σ = 229763952. Its totient is φ = 203891200.

The previous prime is 216816773. The next prime is 216816839. The reversal of 216816827 is 728618612.

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

It is not a de Polignac number, because 216816827 - 2⁶ = 216816763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216816857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18452 + ... + 27822.

It is an arithmetic number, because the mean of its divisors is an integer number (28720494).

Almost surely, 2^216816827 is an apocalyptic number.

216816827 is a deficient number, since it is larger than the sum of its proper divisors (12947125).

216816827 is a wasteful number, since it uses less digits than its factorization.

216816827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749.

The product of its digits is 64512, while the sum is 41.

The square root of 216816827 is about 14724.7012533362. The cubic root of 216816827 is about 600.7553699243.

The spelling of 216816827 in words is "two hundred sixteen million, eight hundred sixteen thousand, eight hundred twenty-seven".