816563826 has 24 divisors (see below), whose sum is σ = 1905316140. Its totient is φ = 251250336.

The previous prime is 816563807. The next prime is 816563837. The reversal of 816563826 is 628365618.

816563826 is a `hidden beast` number, since 8 + 1 + 6 + 5 + 638 + 2 + 6 = 666.

816563826 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 815159601 + 1404225 = 28551^2 + 1185^2 .

It is a super-3 number, since 3×816563826³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1744561 + ... + 1745028.

Almost surely, 2^816563826 is an apocalyptic number.

816563826 is an abundant number, since it is smaller than the sum of its proper divisors (1088752314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816563826 is a wasteful number, since it uses less digits than its factorization.

816563826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3489610 (or 3489607 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 816563826 is about 28575.5809389766. The cubic root of 816563826 is about 934.6809232770.

The spelling of 816563826 in words is "eight hundred sixteen million, five hundred sixty-three thousand, eight hundred twenty-six".