216806696 has 8 divisors (see below), whose sum is σ = 406512570. Its totient is φ = 108403344.

The previous prime is 216806677. The next prime is 216806713. The reversal of 216806696 is 696608612.

It can be written as a sum of positive squares in only one way, i.e., 122988100 + 93818596 = 11090^2 + 9686^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13550411 + ... + 13550426.

Almost surely, 2^216806696 is an apocalyptic number.

216806696 is the 7871-st centered heptagonal number.

It is an amenable number.

216806696 is a deficient number, since it is larger than the sum of its proper divisors (189705874).

216806696 is a wasteful number, since it uses less digits than its factorization.

216806696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27100843 (or 27100839 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 216806696 is about 14724.3572355468. The cubic root of 216806696 is about 600.7460127978.

The spelling of 216806696 in words is "two hundred sixteen million, eight hundred six thousand, six hundred ninety-six".