28081788656 has 40 divisors (see below), whose sum is σ = 54792993024. Its totient is φ = 13941823680.

The previous prime is 28081788653. The next prime is 28081788673. The reversal of 28081788656 is 65688718082.

It is a junction number, because it is equal to n+sod(n) for n = 28081788595 and 28081788604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081788653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3206075 + ... + 3214821.

Almost surely, 2^28081788656 is an apocalyptic number.

It is an amenable number.

28081788656 is a deficient number, since it is larger than the sum of its proper divisors (26711204368).

28081788656 is a wasteful number, since it uses less digits than its factorization.

28081788656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10149 (or 10143 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 59.

The spelling of 28081788656 in words is "twenty-eight billion, eighty-one million, seven hundred eighty-eight thousand, six hundred fifty-six".