28138787711325 has 36 divisors (see below), whose sum is σ = 51225919861428. Its totient is φ = 14761331251200.

The previous prime is 28138787711291. The next prime is 28138787711383. The reversal of 28138787711325 is 52311778783182.

28138787711325 is a `hidden beast` number, since 2 + 81 + 387 + 87 + 71 + 1 + 32 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 3644781175161 + 24494006536164 = 1909131^2 + 4949142^2 .

It is not a de Polignac number, because 28138787711325 - 2¹⁶ = 28138787645789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1025078724 + ... + 1025106173.

It is an arithmetic number, because the mean of its divisors is an integer number (1422942218373).

Almost surely, 2^{28138787711325} is an apocalyptic number.

28138787711325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28138787711325 is a deficient number, since it is larger than the sum of its proper divisors (23087132150103).

28138787711325 is a wasteful number, since it uses less digits than its factorization.

28138787711325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050184974 (or 2050184966 counting only the distinct ones).

The product of its digits is 31610880, while the sum is 63.

The spelling of 28138787711325 in words is "twenty-eight trillion, one hundred thirty-eight billion, seven hundred eighty-seven million, seven hundred eleven thousand, three hundred twenty-five".