216213278 has 8 divisors (see below), whose sum is σ = 324382320. Its totient is φ = 108085840.

The previous prime is 216213253. The next prime is 216213281. The reversal of 216213278 is 872312612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15023 + ... + 25653.

It is an arithmetic number, because the mean of its divisors is an integer number (40547790).

Almost surely, 2^216213278 is an apocalyptic number.

216213278 is a deficient number, since it is larger than the sum of its proper divisors (108169042).

216213278 is a wasteful number, since it uses less digits than its factorization.

216213278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20802.

The product of its digits is 8064, while the sum is 32.

The square root of 216213278 is about 14704.1925313837. The cubic root of 216213278 is about 600.1974146683.

The spelling of 216213278 in words is "two hundred sixteen million, two hundred thirteen thousand, two hundred seventy-eight".