806828428666 has 40 divisors (see below), whose sum is σ = 1356305542020. Its totient is φ = 359540842752.

The previous prime is 806828428633. The next prime is 806828428669. The reversal of 806828428666 is 666824828608.

It can be written as a sum of positive squares in 10 ways, for example, as 401404609225 + 405423819441 = 633565^2 + 636729^2 .

It is a super-2 number, since 2×806828428666² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 806828428598 and 806828428607.

It is not an unprimeable number, because it can be changed into a prime (806828428669) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1413010 + ... + 1900066.

Almost surely, 2^806828428666 is an apocalyptic number.

806828428666 is a deficient number, since it is larger than the sum of its proper divisors (549477113354).

806828428666 is an equidigital number, since it uses as much as digits as its factorization.

806828428666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487140 (or 487101 counting only the distinct ones).

The product of its (nonzero) digits is 84934656, while the sum is 64.

The spelling of 806828428666 in words is "eight hundred six billion, eight hundred twenty-eight million, four hundred twenty-eight thousand, six hundred sixty-six".