28820826644868 has 72 divisors (see below), whose sum is σ = 75644281308960. Its totient is φ = 9595066870080.

The previous prime is 28820826644867. The next prime is 28820826644873. The reversal of 28820826644868 is 86844662802882.

28820826644868 is a `hidden beast` number, since 2 + 8 + 8 + 2 + 0 + 82 + 6 + 64 + 486 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28820826644796 and 28820826644805.

It is not an unprimeable number, because it can be changed into a prime (28820826644867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17539398 + ... + 19112093.

It is an arithmetic number, because the mean of its divisors is an integer number (1050615018180).

Almost surely, 2^{28820826644868} is an apocalyptic number.

It is an amenable number.

28820826644868 is an abundant number, since it is smaller than the sum of its proper divisors (46823454664092).

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

28820826644868 is a wasteful number, since it uses less digits than its factorization.

28820826644868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36652319 (or 36652305 counting only the distinct ones).

The product of its (nonzero) digits is 905969664, while the sum is 72.

The spelling of 28820826644868 in words is "twenty-eight trillion, eight hundred twenty billion, eight hundred twenty-six million, six hundred forty-four thousand, eight hundred sixty-eight".