816628 has 12 divisors (see below), whose sum is σ = 1442980. Its totient is φ = 404352.

The previous prime is 816593. The next prime is 816649. The reversal of 816628 is 826618.

It can be written as a sum of positive squares in 2 ways, for example, as 242064 + 574564 = 492^2 + 758^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 816628.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501 + ... + 1372.

2⁸¹⁶⁶²⁸ is an apocalyptic number.

It is an amenable number.

816628 is a deficient number, since it is larger than the sum of its proper divisors (626352).

816628 is a wasteful number, since it uses less digits than its factorization.

816628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986 (or 1984 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 816628 is about 903.6747202395. The cubic root of 816628 is about 93.4705408255.

It can be divided in two parts, 816 and 628, that added together give a square (1444 = 38²).

The spelling of 816628 in words is "eight hundred sixteen thousand, six hundred twenty-eight".