216978683 has 8 divisors (see below), whose sum is σ = 224952336. Its totient is φ = 209132800.

The previous prime is 216978679. The next prime is 216978691. The reversal of 216978683 is 386879612.

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

It is not a de Polignac number, because 216978683 - 2² = 216978679 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216978623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28478 + ... + 35283.

It is an arithmetic number, because the mean of its divisors is an integer number (28119042).

Almost surely, 2^216978683 is an apocalyptic number.

216978683 is a deficient number, since it is larger than the sum of its proper divisors (7973653).

216978683 is an equidigital number, since it uses as much as digits as its factorization.

216978683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63885.

The product of its digits is 870912, while the sum is 50.

The square root of 216978683 is about 14730.1962987599. The cubic root of 216978683 is about 600.9048227700.

The spelling of 216978683 in words is "two hundred sixteen million, nine hundred seventy-eight thousand, six hundred eighty-three".