28081788538 has 16 divisors (see below), whose sum is σ = 44940956544. Its totient is φ = 13114079680.

The previous prime is 28081788533. The next prime is 28081788541. The reversal of 28081788538 is 83588718082.

28081788538 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (28081788533) 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, 3147970 + ... + 3156877.

It is an arithmetic number, because the mean of its divisors is an integer number (2808809784).

Almost surely, 2^28081788538 is an apocalyptic number.

28081788538 is a deficient number, since it is larger than the sum of its proper divisors (16859168006).

28081788538 is a wasteful number, since it uses less digits than its factorization.

28081788538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6304997.

The product of its (nonzero) digits is 6881280, while the sum is 58.

The spelling of 28081788538 in words is "twenty-eight billion, eighty-one million, seven hundred eighty-eight thousand, five hundred thirty-eight".