28813365025 has 27 divisors (see below), whose sum is σ = 37972896619. Its totient is φ = 21683905280.

The previous prime is 28813365013. The next prime is 28813365047. The reversal of 28813365025 is 52056331882.

The square root of 28813365025 is 169745.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 26099371809 + 2713993216 = 161553^2 + 52096^2 .

It is not a de Polignac number, because 28813365025 - 2⁹ = 28813364513 is a prime.

It is a Duffinian 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 26 ways as a sum of consecutive naturals, for example, 14427327 + ... + 14429323.

Almost surely, 2^28813365025 is an apocalyptic number.

28813365025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28813365025 is the 169745-th square number.

28813365025 is the 84873-rd centered octagonal number.

It is an amenable number.

28813365025 is a deficient number, since it is larger than the sum of its proper divisors (9159531594).

28813365025 is an frugal number, since it uses more digits than its factorization.

28813365025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038 (or 2019 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 28813365025 in words is "twenty-eight billion, eight hundred thirteen million, three hundred sixty-five thousand, twenty-five".