28821594568 has 16 divisors (see below), whose sum is σ = 58197450780. Its totient is φ = 13302274368.

The previous prime is 28821594559. The next prime is 28821594583. The reversal of 28821594568 is 86549512882.

It can be written as a sum of positive squares in 2 ways, for example, as 26017044804 + 2804549764 = 161298^2 + 52958^2 .

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, 138565255 + ... + 138565462.

Almost surely, 2^28821594568 is an apocalyptic number.

It is an amenable number.

28821594568 is an abundant number, since it is smaller than the sum of its proper divisors (29375856212).

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

28821594568 is a wasteful number, since it uses less digits than its factorization.

28821594568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277130736 (or 277130732 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 58.

The spelling of 28821594568 in words is "twenty-eight billion, eight hundred twenty-one million, five hundred ninety-four thousand, five hundred sixty-eight".