816761 has 8 divisors (see below), whose sum is σ = 913248. Its totient is φ = 724000.

The previous prime is 816743. The next prime is 816763. The reversal of 816761 is 167618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816761 is a prime.

It is a super-2 number, since 2×816761² = 1334197062242, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455 + ... + 1356.

It is an arithmetic number, because the mean of its divisors is an integer number (114156).

2⁸¹⁶⁷⁶¹ is an apocalyptic number.

It is an amenable number.

816761 is a deficient number, since it is larger than the sum of its proper divisors (96487).

816761 is a wasteful number, since it uses less digits than its factorization.

816761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863.

The product of its digits is 2016, while the sum is 29.

The square root of 816761 is about 903.7483056692. The cubic root of 816761 is about 93.4756149054.

It can be divided in two parts, 8167 and 61, that added together give a palindrome (8228).

The spelling of 816761 in words is "eight hundred sixteen thousand, seven hundred sixty-one".