28668683856 has 80 divisors (see below), whose sum is σ = 78447175488. Its totient is φ = 8990668800.

The previous prime is 28668683851. The next prime is 28668683863. The reversal of 28668683856 is 65838686682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28668683851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2917191 + ... + 2927001.

Almost surely, 2^28668683856 is an apocalyptic number.

It is an amenable number.

28668683856 is an abundant number, since it is smaller than the sum of its proper divisors (49778491632).

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

28668683856 is a wasteful number, since it uses less digits than its factorization.

28668683856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13420 (or 13414 counting only the distinct ones).

The product of its digits is 159252480, while the sum is 66.

The spelling of 28668683856 in words is "twenty-eight billion, six hundred sixty-eight million, six hundred eighty-three thousand, eight hundred fifty-six".