216824649 has 8 divisors (see below), whose sum is σ = 289578240. Its totient is φ = 144310416.

The previous prime is 216824627. The next prime is 216824659. The reversal of 216824649 is 946428612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216824649 - 2⁷ = 216824521 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216824649.

It is not an unprimeable number, because it can be changed into a prime (216824609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57714 + ... + 61355.

It is an arithmetic number, because the mean of its divisors is an integer number (36197280).

Almost surely, 2^216824649 is an apocalyptic number.

It is an amenable number.

216824649 is a deficient number, since it is larger than the sum of its proper divisors (72753591).

216824649 is a wasteful number, since it uses less digits than its factorization.

216824649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119679.

The product of its digits is 165888, while the sum is 42.

The square root of 216824649 is about 14724.9668590459. The cubic root of 216824649 is about 600.7625942283.

The spelling of 216824649 in words is "two hundred sixteen million, eight hundred twenty-four thousand, six hundred forty-nine".