28668684686 has 16 divisors (see below), whose sum is σ = 44505925200. Its totient is φ = 13833821568.

The previous prime is 28668684683. The next prime is 28668684721. The reversal of 28668684686 is 68648686682.

It is a super-4 number, since 4×28668684686⁴ (a number of 43 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28668684683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19910 + ... + 240278.

It is an arithmetic number, because the mean of its divisors is an integer number (2781620325).

Almost surely, 2^28668684686 is an apocalyptic number.

28668684686 is a deficient number, since it is larger than the sum of its proper divisors (15837240514).

28668684686 is a wasteful number, since it uses less digits than its factorization.

28668684686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222643.

The product of its digits is 254803968, while the sum is 68.

The spelling of 28668684686 in words is "twenty-eight billion, six hundred sixty-eight million, six hundred eighty-four thousand, six hundred eighty-six".