28137986125 has 8 divisors (see below), whose sum is σ = 35116206840. Its totient is φ = 22510388800.

The previous prime is 28137986119. The next prime is 28137986161. The reversal of 28137986125 is 52168973182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65318724 + 28072667401 = 8082^2 + 167549^2 .

It is not a de Polignac number, because 28137986125 - 2¹⁵ = 28137953357 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112551820 + ... + 112552069.

It is an arithmetic number, because the mean of its divisors is an integer number (4389525855).

Almost surely, 2^28137986125 is an apocalyptic number.

28137986125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28137986125 is a deficient number, since it is larger than the sum of its proper divisors (6978220715).

28137986125 is an equidigital number, since it uses as much as digits as its factorization.

28137986125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225103904 (or 225103894 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 52.

The spelling of 28137986125 in words is "twenty-eight billion, one hundred thirty-seven million, nine hundred eighty-six thousand, one hundred twenty-five".