28778743568 has 20 divisors (see below), whose sum is σ = 55811302848. Its totient is φ = 14375826720.

The previous prime is 28778743519. The next prime is 28778743589. The reversal of 28778743568 is 86534787782.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 829028 + ... + 863043.

Almost surely, 2^28778743568 is an apocalyptic number.

It is an amenable number.

28778743568 is a deficient number, since it is larger than the sum of its proper divisors (27032559280).

28778743568 is a wasteful number, since it uses less digits than its factorization.

28778743568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693142 (or 1693136 counting only the distinct ones).

The product of its digits is 126443520, while the sum is 65.

The spelling of 28778743568 in words is "twenty-eight billion, seven hundred seventy-eight million, seven hundred forty-three thousand, five hundred sixty-eight".