28125260648 has 8 divisors (see below), whose sum is σ = 52734863730. Its totient is φ = 14062630320.

The previous prime is 28125260633. The next prime is 28125260731. The reversal of 28125260648 is 84606252182.

It can be written as a sum of positive squares in only one way, i.e., 28002006244 + 123254404 = 167338^2 + 11102^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28125260599 and 28125260608.

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, 1757828783 + ... + 1757828798.

Almost surely, 2^28125260648 is an apocalyptic number.

It is an amenable number.

28125260648 is a deficient number, since it is larger than the sum of its proper divisors (24609603082).

28125260648 is a wasteful number, since it uses less digits than its factorization.

28125260648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3515657587 (or 3515657583 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 44.

The spelling of 28125260648 in words is "twenty-eight billion, one hundred twenty-five million, two hundred sixty thousand, six hundred forty-eight".