28644325 has 6 divisors (see below), whose sum is σ = 35518994. Its totient is φ = 22915440.

The previous prime is 28644313. The next prime is 28644331. The reversal of 28644325 is 52344682.

It can be written as a sum of positive squares in 3 ways, for example, as 2090916 + 26553409 = 1446^2 + 5153^2 .

It is not a de Polignac number, because 28644325 - 2¹¹ = 28642277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572862 + ... + 572911.

Almost surely, 2^28644325 is an apocalyptic number.

28644325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28644325 is a deficient number, since it is larger than the sum of its proper divisors (6874669).

28644325 is a wasteful number, since it uses less digits than its factorization.

28644325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145783 (or 1145778 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The square root of 28644325 is about 5352.0393309467. The cubic root of 28644325 is about 305.9704821513.

The spelling of 28644325 in words is "twenty-eight million, six hundred forty-four thousand, three hundred twenty-five".