816688 has 10 divisors (see below), whose sum is σ = 1582364. Its totient is φ = 408336.

The previous prime is 816667. The next prime is 816689. The reversal of 816688 is 886618.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (816689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25506 + ... + 25537.

2⁸¹⁶⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

816688 is a deficient number, since it is larger than the sum of its proper divisors (765676).

816688 is a wasteful number, since it uses less digits than its factorization.

816688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51051 (or 51045 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 816688 is about 903.7079174158. The cubic root of 816688 is about 93.4728299523.

The spelling of 816688 in words is "eight hundred sixteen thousand, six hundred eighty-eight".