216563894 has 8 divisors (see below), whose sum is σ = 324926640. Its totient is φ = 108255016.

The previous prime is 216563857. The next prime is 216563911. The reversal of 216563894 is 498365612.

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

It is an alternating number because its digits alternate between even and odd.

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, 1169 + ... + 20844.

It is an arithmetic number, because the mean of its divisors is an integer number (40615830).

Almost surely, 2^216563894 is an apocalyptic number.

216563894 is a deficient number, since it is larger than the sum of its proper divisors (108362746).

216563894 is a wasteful number, since it uses less digits than its factorization.

216563894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26934.

The product of its digits is 311040, while the sum is 44.

The square root of 216563894 is about 14716.1100158975. The cubic root of 216563894 is about 600.5216703760.

The spelling of 216563894 in words is "two hundred sixteen million, five hundred sixty-three thousand, eight hundred ninety-four".