28688071768 has 8 divisors (see below), whose sum is σ = 53790134580. Its totient is φ = 14344035880.

The previous prime is 28688071759. The next prime is 28688071781. The reversal of 28688071768 is 86717088682.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1793004478 + ... + 1793004493.

Almost surely, 2^28688071768 is an apocalyptic number.

It is an amenable number.

28688071768 is a deficient number, since it is larger than the sum of its proper divisors (25102062812).

28688071768 is a wasteful number, since it uses less digits than its factorization.

28688071768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586008977 (or 3586008973 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 61.

The spelling of 28688071768 in words is "twenty-eight billion, six hundred eighty-eight million, seventy-one thousand, seven hundred sixty-eight".