216863824 has 10 divisors (see below), whose sum is σ = 420173690. Its totient is φ = 108431904.

The previous prime is 216863809. The next prime is 216863831. The reversal of 216863824 is 428368612.

It can be written as a sum of positive squares in only one way, i.e., 162103824 + 54760000 = 12732^2 + 7400^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6776979 + ... + 6777010.

It is an arithmetic number, because the mean of its divisors is an integer number (42017369).

Almost surely, 2^216863824 is an apocalyptic number.

It is an amenable number.

216863824 is a deficient number, since it is larger than the sum of its proper divisors (203309866).

216863824 is a wasteful number, since it uses less digits than its factorization.

216863824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13553997 (or 13553991 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 216863824 is about 14726.2970226734. The cubic root of 216863824 is about 600.7987731675.

The spelling of 216863824 in words is "two hundred sixteen million, eight hundred sixty-three thousand, eight hundred twenty-four".