28508391112 has 8 divisors (see below), whose sum is σ = 53453233350. Its totient is φ = 14254195552.

The previous prime is 28508391091. The next prime is 28508391193. The reversal of 28508391112 is 21119380582.

It can be written as a sum of positive squares in only one way, i.e., 14836701636 + 13671689476 = 121806^2 + 116926^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1781774437 + ... + 1781774452.

Almost surely, 2^28508391112 is an apocalyptic number.

It is an amenable number.

28508391112 is a deficient number, since it is larger than the sum of its proper divisors (24944842238).

28508391112 is a wasteful number, since it uses less digits than its factorization.

28508391112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3563548895 (or 3563548891 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 28508391112 in words is "twenty-eight billion, five hundred eight million, three hundred ninety-one thousand, one hundred twelve".