216890824 has 8 divisors (see below), whose sum is σ = 406670310. Its totient is φ = 108445408.

The previous prime is 216890803. The next prime is 216890831. The reversal of 216890824 is 428098612.

It can be written as a sum of positive squares in only one way, i.e., 206841924 + 10048900 = 14382^2 + 3170^2 .

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 (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13555669 + ... + 13555684.

Almost surely, 2^216890824 is an apocalyptic number.

It is an amenable number.

216890824 is a deficient number, since it is larger than the sum of its proper divisors (189779486).

216890824 is a wasteful number, since it uses less digits than its factorization.

216890824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27111359 (or 27111355 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 216890824 is about 14727.2137215428. The cubic root of 216890824 is about 600.8237057011.

The spelling of 216890824 in words is "two hundred sixteen million, eight hundred ninety thousand, eight hundred twenty-four".