28225680025 has 9 divisors (see below), whose sum is σ = 35000884893. Its totient is φ = 22579872000.

The previous prime is 28225679981. The next prime is 28225680073. The reversal of 28225680025 is 52008652282.

It is a happy number.

The square root of 28225680025 is 168005.

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

It can be written as a sum of positive squares in 4 ways, for example, as 15718389129 + 12507290896 = 125373^2 + 111836^2 .

It is not a de Polignac number, because 28225680025 - 2²¹ = 28223582873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28225680025.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 823225 + ... + 856825.

Almost surely, 2^28225680025 is an apocalyptic number.

28225680025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28225680025 is the 168005-th square number.

28225680025 is the 84003-rd centered octagonal number.

It is an amenable number.

28225680025 is a deficient number, since it is larger than the sum of its proper divisors (6775204868).

28225680025 is an frugal number, since it uses more digits than its factorization.

28225680025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67212 (or 33606 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 40.

The spelling of 28225680025 in words is "twenty-eight billion, two hundred twenty-five million, six hundred eighty thousand, twenty-five".