216236816 has 20 divisors (see below), whose sum is σ = 422805900. Its totient is φ = 107125632.

The previous prime is 216236807. The next prime is 216236851. The reversal of 216236816 is 618632612.

It can be written as a sum of positive squares in 2 ways, for example, as 108076816 + 108160000 = 10396^2 + 10400^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60251 + ... + 63738.

It is an arithmetic number, because the mean of its divisors is an integer number (21140295).

Almost surely, 2^216236816 is an apocalyptic number.

It is an amenable number.

216236816 is a deficient number, since it is larger than the sum of its proper divisors (206569084).

216236816 is a wasteful number, since it uses less digits than its factorization.

216236816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124106 (or 124100 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 216236816 is about 14704.9928935719. The cubic root of 216236816 is about 600.2191939876.

The spelling of 216236816 in words is "two hundred sixteen million, two hundred thirty-six thousand, eight hundred sixteen".