817689616 has 20 divisors (see below), whose sum is σ = 1586648572. Its totient is φ = 408231936.

The previous prime is 817689611. The next prime is 817689619. The reversal of 817689616 is 616986718.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 420086016 + 397603600 = 20496^2 + 19940^2 .

It is a super-2 number, since 2×817689616² = 1337232616228454912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (817689611) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 27201 + ... + 48736.

Almost surely, 2^817689616 is an apocalyptic number.

It is an amenable number.

817689616 is a deficient number, since it is larger than the sum of its proper divisors (768958956).

817689616 is a wasteful number, since it uses less digits than its factorization.

817689616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76618 (or 76612 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 817689616 is about 28595.2726162910. The cubic root of 817689616 is about 935.1102717227.

The spelling of 817689616 in words is "eight hundred seventeen million, six hundred eighty-nine thousand, six hundred sixteen".