28508005525 has 12 divisors (see below), whose sum is σ = 35436369700. Its totient is φ = 22750634880.

The previous prime is 28508005499. The next prime is 28508005529. The reversal of 28508005525 is 52550080582.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4418792676 + 24089212849 = 66474^2 + 155207^2 .

It is not a de Polignac number, because 28508005525 - 2¹³ = 28507997333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28508005529) by changing a digit.

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, 1383810 + ... + 1404259.

Almost surely, 2^28508005525 is an apocalyptic number.

28508005525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28508005525 is a deficient number, since it is larger than the sum of its proper divisors (6928364175).

28508005525 is a wasteful number, since it uses less digits than its factorization.

28508005525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2788488 (or 2788483 counting only the distinct ones).

The product of its (nonzero) digits is 160000, while the sum is 40.

The spelling of 28508005525 in words is "twenty-eight billion, five hundred eight million, five thousand, five hundred twenty-five".