28028118725 has 12 divisors (see below), whose sum is σ = 34766214180. Its totient is φ = 22415174400.

The previous prime is 28028118689. The next prime is 28028118763. The reversal of 28028118725 is 52781182082.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1560408004 + 26467710721 = 39502^2 + 162689^2 .

It is not a de Polignac number, because 28028118725 - 2⁶ = 28028118661 is a prime.

It is a Curzon number.

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 104246 + ... + 258695.

It is an arithmetic number, because the mean of its divisors is an integer number (2897184515).

Almost surely, 2^28028118725 is an apocalyptic number.

28028118725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28028118725 is a deficient number, since it is larger than the sum of its proper divisors (6738095455).

28028118725 is a wasteful number, since it uses less digits than its factorization.

28028118725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366040 (or 366035 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 44.

The spelling of 28028118725 in words is "twenty-eight billion, twenty-eight million, one hundred eighteen thousand, seven hundred twenty-five".