28078732738 has 12 divisors (see below), whose sum is σ = 48994523622. Its totient is φ = 12033742560.

The previous prime is 28078732663. The next prime is 28078732751. The reversal of 28078732738 is 83723787082.

It is a happy number.

28078732738 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 19578445929 + 8500286809 = 139923^2 + 92197^2 .

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 5 ways as a sum of consecutive naturals, for example, 143258743 + ... + 143258938.

Almost surely, 2^28078732738 is an apocalyptic number.

28078732738 is a deficient number, since it is larger than the sum of its proper divisors (20915790884).

28078732738 is a wasteful number, since it uses less digits than its factorization.

28078732738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286517697 (or 286517690 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 55.

The spelling of 28078732738 in words is "twenty-eight billion, seventy-eight million, seven hundred thirty-two thousand, seven hundred thirty-eight".