816629 has 12 divisors (see below), whose sum is σ = 952812. Its totient is φ = 696960.

The previous prime is 816593. The next prime is 816649. The reversal of 816629 is 926618.

It can be written as a sum of positive squares in 2 ways, for example, as 592900 + 223729 = 770^2 + 473^2 .

It is a de Polignac number, because none of the positive numbers 2^k-816629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 816595 and 816604.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 816629.

It is not an unprimeable number, because it can be changed into a prime (816649) 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 11 ways as a sum of consecutive naturals, for example, 1859 + ... + 2255.

It is an arithmetic number, because the mean of its divisors is an integer number (79401).

2⁸¹⁶⁶²⁹ is an apocalyptic number.

It is an amenable number.

816629 is a deficient number, since it is larger than the sum of its proper divisors (136183).

816629 is a wasteful number, since it uses less digits than its factorization.

816629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 425 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 816629 is about 903.6752735358. The cubic root of 816629 is about 93.4705789785.

The spelling of 816629 in words is "eight hundred sixteen thousand, six hundred twenty-nine".