816775 has 12 divisors (see below), whose sum is σ = 1041352. Its totient is φ = 635040.

The previous prime is 816769. The next prime is 816779. The reversal of 816775 is 577618.

It is not a de Polignac number, because 816775 - 2⁵ = 816743 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

816775 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 816775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 484 + ... + 1366.

2⁸¹⁶⁷⁷⁵ is an apocalyptic number.

816775 is a deficient number, since it is larger than the sum of its proper divisors (224577).

816775 is a wasteful number, since it uses less digits than its factorization.

816775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 925 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 816775 is about 903.7560511554. The cubic root of 816775 is about 93.4761489870.

The spelling of 816775 in words is "eight hundred sixteen thousand, seven hundred seventy-five".