28728571408 has 10 divisors (see below), whose sum is σ = 55661607134. Its totient is φ = 14364285696.

The previous prime is 28728571331. The next prime is 28728571471. The reversal of 28728571408 is 80417582782.

It can be written as a sum of positive squares in only one way, i.e., 28644885504 + 83685904 = 169248^2 + 9148^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 897767841 + ... + 897767872.

Almost surely, 2^28728571408 is an apocalyptic number.

It is an amenable number.

28728571408 is a deficient number, since it is larger than the sum of its proper divisors (26933035726).

28728571408 is a wasteful number, since it uses less digits than its factorization.

28728571408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795535721 (or 1795535715 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 52.

The spelling of 28728571408 in words is "twenty-eight billion, seven hundred twenty-eight million, five hundred seventy-one thousand, four hundred eight".