816634 has 24 divisors (see below), whose sum is σ = 1536948. Its totient is φ = 322560.

The previous prime is 816593. The next prime is 816649. The reversal of 816634 is 436618.

It can be written as a sum of positive squares in 2 ways, for example, as 815409 + 1225 = 903^2 + 35^2 .

It is a congruent number.

It is an unprimeable number.

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, 954 + ... + 1594.

2⁸¹⁶⁶³⁴ is an apocalyptic number.

816634 is a deficient number, since it is larger than the sum of its proper divisors (720314).

816634 is a wasteful number, since it uses less digits than its factorization.

816634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 663 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 816634 is about 903.6780400120. The cubic root of 816634 is about 93.4707697432.

The spelling of 816634 in words is "eight hundred sixteen thousand, six hundred thirty-four".