816687 has 12 divisors (see below), whose sum is σ = 1192464. Its totient is φ = 538560.

The previous prime is 816667. The next prime is 816689. The reversal of 816687 is 786618.

It is not a de Polignac number, because 816687 - 2⁷ = 816559 is a prime.

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 487 + ... + 1367.

It is an arithmetic number, because the mean of its divisors is an integer number (99372).

2⁸¹⁶⁶⁸⁷ is an apocalyptic number.

816687 is a deficient number, since it is larger than the sum of its proper divisors (375777).

816687 is a wasteful number, since it uses less digits than its factorization.

816687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990 (or 987 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 816687 is about 903.7073641395. The cubic root of 816687 is about 93.4727918011.

The spelling of 816687 in words is "eight hundred sixteen thousand, six hundred eighty-seven".