28180840525 has 6 divisors (see below), whose sum is σ = 34944242282. Its totient is φ = 22544672400.

The previous prime is 28180840447. The next prime is 28180840607. The reversal of 28180840525 is 52504808182.

It can be written as a sum of positive squares in 3 ways, for example, as 341584324 + 27839256201 = 18482^2 + 166851^2 .

It is not a de Polignac number, because 28180840525 - 2²³ = 28172451917 is a prime.

It is a Duffinian 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 5 ways as a sum of consecutive naturals, for example, 563616786 + ... + 563616835.

Almost surely, 2^28180840525 is an apocalyptic number.

28180840525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28180840525 is a deficient number, since it is larger than the sum of its proper divisors (6763401757).

28180840525 is a wasteful number, since it uses less digits than its factorization.

28180840525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127233631 (or 1127233626 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 43.

The spelling of 28180840525 in words is "twenty-eight billion, one hundred eighty million, eight hundred forty thousand, five hundred twenty-five".