28047768818 has 24 divisors (see below), whose sum is σ = 46135556532. Its totient is φ = 12743800832.

The previous prime is 28047768797. The next prime is 28047768851. The reversal of 28047768818 is 81886774082.

It can be written as a sum of positive squares in 6 ways, for example, as 11764222369 + 16283546449 = 108463^2 + 127607^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 461855 + ... + 519042.

Almost surely, 2^28047768818 is an apocalyptic number.

28047768818 is a deficient number, since it is larger than the sum of its proper divisors (18087787714).

28047768818 is a wasteful number, since it uses less digits than its factorization.

28047768818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980974 (or 980945 counting only the distinct ones).

The product of its (nonzero) digits is 9633792, while the sum is 59.

The spelling of 28047768818 in words is "twenty-eight billion, forty-seven million, seven hundred sixty-eight thousand, eight hundred eighteen".