216291616 has 12 divisors (see below), whose sum is σ = 425824182. Its totient is φ = 108145792.

The previous prime is 216291613. The next prime is 216291617. The reversal of 216291616 is 616192612.

It can be written as a sum of positive squares in only one way, i.e., 213744400 + 2547216 = 14620^2 + 1596^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (216291613) by changing a digit.

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 as a sum of consecutive naturals, namely, 3379525 + ... + 3379588.

Almost surely, 2^216291616 is an apocalyptic number.

It is an amenable number.

216291616 is a deficient number, since it is larger than the sum of its proper divisors (209532566).

216291616 is an equidigital number, since it uses as much as digits as its factorization.

216291616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759123 (or 6759115 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 216291616 is about 14706.8560882331. The cubic root of 216291616 is about 600.2698933925.

The spelling of 216291616 in words is "two hundred sixteen million, two hundred ninety-one thousand, six hundred sixteen".