28717523978688 has 84 divisors (see below), whose sum is σ = 84968874763968. Its totient is φ = 9263717406720.

The previous prime is 28717523978651. The next prime is 28717523978711. The reversal of 28717523978688 is 88687932571782.

It is a happy number.

28717523978688 is a `hidden beast` number, since 2 + 8 + 7 + 1 + 7 + 523 + 9 + 7 + 8 + 6 + 88 = 666.

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 in 11 ways as a sum of consecutive naturals, for example, 804124281 + ... + 804159992.

Almost surely, 2^{28717523978688} is an apocalyptic number.

It is an amenable number.

28717523978688 is an abundant number, since it is smaller than the sum of its proper divisors (56251350785280).

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

28717523978688 is a wasteful number, since it uses less digits than its factorization.

28717523978688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608284322 (or 1608284309 counting only the distinct ones).

The product of its digits is 4551966720, while the sum is 81.

The spelling of 28717523978688 in words is "twenty-eight trillion, seven hundred seventeen billion, five hundred twenty-three million, nine hundred seventy-eight thousand, six hundred eighty-eight".