216985264 has 10 divisors (see below), whose sum is σ = 420408980. Its totient is φ = 108492624.

The previous prime is 216985261. The next prime is 216985283. The reversal of 216985264 is 462589612.

It is a self number, because there is not a number n which added to its sum of digits gives 216985264.

It is not an unprimeable number, because it can be changed into a prime (216985261) by changing a digit.

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, 6780774 + ... + 6780805.

It is an arithmetic number, because the mean of its divisors is an integer number (42040898).

Almost surely, 2^216985264 is an apocalyptic number.

It is an amenable number.

216985264 is a deficient number, since it is larger than the sum of its proper divisors (203423716).

216985264 is a wasteful number, since it uses less digits than its factorization.

216985264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13561587 (or 13561581 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 216985264 is about 14730.4196817334. The cubic root of 216985264 is about 600.9108978901.

It can be divided in two parts, 21698 and 5264, that added together give a palindrome (26962).

The spelling of 216985264 in words is "two hundred sixteen million, nine hundred eighty-five thousand, two hundred sixty-four".