28628780872 has 16 divisors (see below), whose sum is σ = 54088729200. Its totient is φ = 14205119760.

The previous prime is 28628780867. The next prime is 28628780903. The reversal of 28628780872 is 27808782682.

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, 13657722 + ... + 13659817.

It is an arithmetic number, because the mean of its divisors is an integer number (3380545575).

Almost surely, 2^28628780872 is an apocalyptic number.

It is an amenable number.

28628780872 is a deficient number, since it is larger than the sum of its proper divisors (25459948328).

28628780872 is a wasteful number, since it uses less digits than its factorization.

28628780872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27317676 (or 27317672 counting only the distinct ones).

The product of its (nonzero) digits is 9633792, while the sum is 58.

The spelling of 28628780872 in words is "twenty-eight billion, six hundred twenty-eight million, seven hundred eighty thousand, eight hundred seventy-two".