216286881 has 8 divisors (see below), whose sum is σ = 289293504. Its totient is φ = 143735760.

The previous prime is 216286853. The next prime is 216286883. The reversal of 216286881 is 188682612.

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

It is not a de Polignac number, because 216286881 - 2¹⁵ = 216254113 is a prime.

It is a super-2 number, since 2×216286881² = 93560029785416322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216286883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112765 + ... + 114666.

It is an arithmetic number, because the mean of its divisors is an integer number (36161688).

Almost surely, 2^216286881 is an apocalyptic number.

It is an amenable number.

216286881 is a deficient number, since it is larger than the sum of its proper divisors (73006623).

216286881 is a wasteful number, since it uses less digits than its factorization.

216286881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227751.

The product of its digits is 73728, while the sum is 42.

The square root of 216286881 is about 14706.6951080112. The cubic root of 216286881 is about 600.2655130429.

The spelling of 216286881 in words is "two hundred sixteen million, two hundred eighty-six thousand, eight hundred eighty-one".